Answers
Answer:
no it is not. The name refers to the chemical formula of water H20 so water is made from elements, but is not itself an element
Related Questions
when h2co3 dissociates into h and hco3- does the ph of the water increase or decrease?
Answers
When H2CO3 dissociates into H and HCO3- the pH of water increases to an extent but not much.
The dissociation of H2CO3 is as follows;H2CO3-->H+ + HCO3-
H2CO3 is considered an acid because it ionizes in H+ and HCO3-. Some of the HCO3- will bond with water and form OH- and H2CO3 again. This is an equilibrium. But If we have only one HCO3- that didn't yet bond to water and formed H2CO3 again, we will have more H+ in the medium, and it will be acid. In fact, there is a constant called Ka that measures how much HCO3- and H2CO3 are in a solution in a given time.The concentration of H+ ions doesn't increase much on dissociation so pH doesn't increase much but to an extent.To learn more about pH visit:
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80 calories must be lost to make water change into ice at 0° C. True False
Answers
a. Among nonpolar liquids, those with higher molar masses tend to have normal boiling points that are (higher, lower, or about the same).
b. Among compounds of approximately the same molar mass, those with greater polarities tend to have enthalpies of vaporization that are (higher, lower, or about the same).
c. Which is the only noble gas listed that is stable as a liquid at 0°C? Explain your answer using the concept of critical temperature.
Answers
Answers are below...and I have answered this question on the basis of above table.
Explanation :-
(a.) Among nonpolar liquids, those with higher molar masses tend to have normal boiling points that are (lower).
(b.) Among compounds of approximately the same molar mass, those with greater polarities tend to have enthalpies of vaporization that are (higher).
(c.) Xe (Xenon), a substance can exist only as a gas at temperatures above its critical temperature. Of the noble gases listed, only Xe has a critical temperature above O°c.
Among nonpolar liquids, those with higher molar masses tend to have normal boiling points that are lower. Among compounds of approximately the same molar mass, those with greater polarities tend to have enthalpies of vaporization that are higher.Xenon can exist only as a gas at temperatures above its critical temperature.
What is a compound?Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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3. A chemist collects 59.0 mL of sulfur dioxide gas on a day when the atmospheric pressure is 0.989 atm. On the
next day, the pressure has changed to 0.967 atm. What will the volume of the SO2 gas be on the second day?
Answers
Answer:
We have a chemist who collects 59 ml of S. 0. 2 at the pressure atmospheric pressure. Also, this one is considered as proven. We one and this one is pretty even so this is 0.989 atmospheres. Now is the second day the pressure atmospheric pressure was 0.967 atmospheres. Then what is the pressure of sulfur dioxide in the flask? Oh, so if you see here, we know that the one we want is equal to P two. We do so from the ideas equation. So this one is equal to what we want we do so we do is equal to P one. We want we do. Then it is equal to P one is 59 B one and B one is 0.989 and debated by 0.967 atmospheres. So this one is atmospheres and atmospheres and this one is Ml. So here the 0.967 atmospheric pressure is 60.34 ML approximating so this is the pressure of the gas at 0.967 on the second day.
Hope it helps!!!Brainliest pls!!!
The concept Boyle's law is used here to determine the new volume of sulphur dioxide. Boyle’s law was put forward by the Anglo-Irish chemist Robert Boyle in the year 1662. Here the new volume is 60.34 mL.
What is Boyle's law?A gas law known as Boyle's law asserts that a gas's pressure is inversely proportional to its volume when it is held at a fixed temperature and of a given mass. To put it another way, as long as the temperature and volume of the gas remain constant, the pressure and volume of the gas are inversely proportional to one another.
For a gas, the relationship between volume and pressure (at constant mass and temperature) can be expressed mathematically as follows.
P = k*(1/V) ⇒ PV = k
For two different gases, the equation is:
P₁V₁ = P₂V₂
V₂ = P₁V₁ / P₂
0.989 × 59.0 / 0.967 = 60.34 mL
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under what circumstances can an atom emit a photon
Answers
Answer:
A photon is emitted when an atom moves from an excited state to its ground state or to a lower-energy excited state.
Explanation:
I honestly know the answer just can't explain it. but here. hope this helps.
2. Predict the shift in the reaction with each stress shift rt, shift left, or no
HEAT + Ti(s) + 2C1 (g)
a. CI, (g) is added to the system.
b. TiCk (g) is removed from the system.
TiCI (g)
c. The temperature of the container is decreased.
d. The pressure of the container is increased.,
e. Ti(s) is added to the system.
Answers
b. The removal of TiCl(k) from the system will shift the reaction right, towards the products, to counteract the decrease in the concentration of TiCl(k).
c. Decreasing the temperature of the container will shift the reaction to the right, towards the products, to counteract the decrease in kinetic energy of the system.
d. Increasing the pressure of the container will shift the reaction to the left, towards the reactants, to counteract the increase in pressure caused by the decrease in volume.
e. Adding Ti(s) to the system will not cause a shift in the reaction because Ti(s) is not involved in the reaction.
Listen and select the one of two statements that corresponds to each drawing. October 28 11:59 PM 1 attempt remaining Grade settings External referencesVocabulary list Grammar explanation 136-139 Questions Modelo You see:Illustration of a girl in a record store with headphones on. You hear: a. Ella sale a bailar. / b. Ella oye música. You select: b
Answers
The statement that corresponds to the drawing of a girl in a record store with headphones on is " Ella oye música." The correct statement is B.
This means "She is listening to music" in English. The drawing depicts a girl wearing headphones while standing in a record store. This indicates that she is most likely listening to music rather than going out to dance, which is what statement a suggests.The correct statement is b, Ella oye música, which correctly describes what the girl in the drawing is doing. She is listening to music.To sum up, when presented with the drawing of a girl in a record store with headphones on, the statement that corresponds to it is "b. Ella oye música." This means "She is listening to music" in English.For more questions on music
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what is Avogadro's number
Answers
Avogadro’s wide variety, the wide variety of gadgets in a single mole of any substance (described as its molecular weight in grams), is the same as 6.02214076 × 1023. The gadgets can be electrons, atoms, ions, or molecules, relying on the character of the substance and the individual of the reaction (if any).
Avogadro's Law
Avogadro's law states that an "equal volume of all gases at the same temperature and pressure contain the same number of molecules"
For example:-
18g of water = 1 mole = 6.022* 10²³ molecules of water
1.008g of hydrogen = 1 mole = 6.022 *10²³ atoms of hydrogen
96.06g of SO₄²- ion = 6.022*10²³ ions of SO₄²-.
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Which option best describes something that causes ionic bonds to form?.
Answers
The option that best describes something that causes ionic bonds to form is the transfer of electron(s) from a metal to a nonmetal.
An ionic bond is formed by the complete transfer of some electrons from one atom to another. The atom that islosing one or more electrons becomes a cation which is a positively charged ion. The atom that is gaining one or more electron becomes an anion which is a negatively charged ion.
Metals are electropositive in nature and they tend to lose electrons, whereas nonmetals are electronegative and tend to gain electrons. A metal atom loses one or more electrons to form a cation with an octet. The same number of electrons are then accepted by the appropriate number of atoms of a nonmetal to form an octet in the anion, producing an ionic compound.
So for an ionic compound there is transfer of electron(s) from a metal to a nonmetal.
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What chemical reaction occurs when the positive ion from one compound replaces the positive ion of the other compound to form two new compounds. represented by AB + CD = AD + CB
synthesis
decomposition
single replacement
double replacement
combustion
Answers
The chemical reaction that occurs when the positive ion from one compound replaces the positive ion of the other compound is double replacement
What is a double displacement reaction?
This is a type of reaction in which there is an exchange of ion between the reacting agent. The ion in one of the reactant replaces or displaces the ion in the other reactant to produce two new products.
The reaction between sulphuric acid and potassium hydroxide illustrates a double displacement reaction
H₂SO₄ + 2KOH —> K₂SO₄ + 2H₂O
From the above equation, we can see that K and H exchange to produce K₂SO₄ and H₂O
With the above illustration we can answer the given question as follow
AB + CD = AD + CB
The above reaction is a double displacement reaction since A and C exchange to produce AD and CB
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A gas sample was produced in the laboratory. The gas was determined to be more dense than air (which is mostly composed of nitrogen). What is the identification of the gas? a)Hydrogen b)Neon c)Methane (CH_4) d)Carbon Dioxide
Answers
The correct option is (d) Carbon Dioxide.
Explanation:
The density of air is around 1.2 g/L, which means that any gas with a density above this value is more dense than air.
Carbon dioxide has a density of approximately 1.98 g/L, which is considerably more dense than air (composed of nitrogen and oxygen).
As a result, if a gas sample is determined to be more dense than air, it is likely to be carbon dioxide (CO2), which has a molecular weight of 44 g/mol.
Carbon dioxide is produced in the laboratory by many chemical reactions and is commonly employed in the food and beverage industries, such as carbonating soda and beer.
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if you have identified a gram positive staphylococci that is positive for catalase production, but negative for coagulase, what is the next test you would do according to the dichotemous key for the identification of gram positive bacteria (found in the experiment 16 ppt?) question 8 options: make a lawn of bacteria on a mueller hinton agar plate and test for penicillin sensitivity. confirm with mannitol fermentation on a msa plate. make a streak plate on sba to test for hemolysis. make a lawn of bacteria on a mueller hinton agar plate and test for novobiacin sensitivity.
Answers
The dichotomous key for the identification of gram-positive bacteria, the next test you would do after identifying a gram-positive staphylococcus that is positive for catalase production but negative for coagulase is to make a lawn of bacteria on a Mueller Hinton agar plate and test for novobiocin sensitivity.
The information provided, if you have identified a Gram-positive staphylococcus that is positive for catalase production but negative for coagulase, the next test to perform according to the dichotomous key for the identification of Gram-positive bacteria (found in Experiment 16 ppt) would be to make a lawn of bacteria on a Mueller Hinton agar plate and test for novobiocin sensitivity.
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A balanced chemical equation takes into account the theory that:
a. Compounds and elements remain unchanged in a chemical reaction
b. Atoms are neither created nor destroyed in a chemical reaction
c. The total mass always increases during a chemical reaction
d. The mass of any gases involved can be ignored.
Which is correct?
Answers
Answer:
b. Atoms are neither created nor destroyed in a chemical reaction
Explanation:
B is correct, because the law of conservation of mass tells us that during a chemical reaction, there is no net gain or loss of mass. Mass comes from the atoms themselves that are participating in the reaction, so there is no gain or loss (creation or destruction) of atoms.
The number of each period in the modern periodic table
represents the number of
Answers
Periods are the horizontal rows of the periodic table, with each period number indicating the number of orbitals for the elements in that row.
What is periodic table?A periodic table, also known as an elemental periodic table, is a tabular representation of the chemical elements. It is widely used in chemistry, physics, and other sciences, and is widely regarded as a chemistry icon.
The arrangement of the periodic table also allows scientists to detect trends in element properties such as electronegativity, ionization energy, and atomic radius.
Periods are basically the horizontal rows. Periods represent the relationship of orbitals, or likely areas where electrons will be found, inside the atom's outermost shell. The periods correspond to atoms with a more electron-rich core of inner shells.
Thus, the number of each period in the modern periodic table represents the number of orbitals.
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Identify each of the following compounds as a nonelectrolyte, a weak electrolyte, or a strong electrolyte: (a) lactose (C12H22O11), (b) lactic acid (HC3H5O3), (c) dimethylamine [(CH3)2NH], (d) barium hydroxide Ba(OH)2.
Answers
The classification of the given compounds is as follows:
(a) lactose (C₁₂H₂₂O₁₁) - non-electrolytes
(b) lactic acid (HC₃H₅O₃) - weak electrolytes
(c) dimethylamine [(CH₃)₂NH] - weak electrolyte
(d) barium hydroxide Ba(OH)₂ - strong electrolytes
What are electrolytes?Electrolytes are substances that when in the molten or solution state conduct electricity and are decomposed by the direct current passing through them.
Electrolytes dissociate into the component ions when they are dissolved in water or in molten form. Some examples of electrolytes are acids and bases.
Strong electrolytes dissociate completely into one while weak electrolytes dissociate partially.
Non-electrolytes do not dissociate into ions in solution but remain as molecules. Some example of non-electrolytes is organic solvents.
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Which element is not abbreviated based on an ancient name?.
Answers
Radium (Ra) is an example of a chemical element which is not abbreviated based on an ancient name.
What is a chemical element?A chemical element can be defined as a pure substance that comprise atoms with the same atomic number (number of protons) in its atomic nucleus.
The examples of a chemical element.
In Chemistry, some examples of a chemical element include the following:
Carbon (C)Iron (Fe)Sodium (Na)Radium (Ra)Generally, a chemical symbol is typically used in chemistry to abbreviate an atom of a given element or a chemical element. Also, some chemical elements are not abbreviated based on an ancient name such as Radium (Ra).
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A reaction is monitored and the products are found to be a salt and water. The reactant(s) must have been _____. two metal-nonmetal compounds a metal-nonmetal compound a metal and a metal-nonmetal compound an acid and a base
Answers
Answer:
D.) An acid and a base
Explanation:
One part of an acid is H+ and the other part is a negatively charged ion. One part of a base is -OH and the other part is a positively charged ion. When an acid and base react, the H+ and -OH combine to form water and the ions combine to form a salt.
The others are incorrect because they do not guarantee that water (H2O) and a salt are products.
17.6 ml of 2-methyl-2-butanol (mm: 88.15 g/mol, d: 0.805 g/ml) is treated with an excess of 8.47 m hcl (mm: 36.46 g/mol). calculate the theoretical yield of t-pentyl chloride mm: 106.59, d: 0.865 g/ml), in ml. report answer to the correct number of sig figs, but do not include units in your answer.
Answers
The theoretical yield of the solution has been obtained as 17.1 g
What is the theoretical yield?Let us recall that each time that we hear about a chemical reaction what we are talking about is the combination of two or more reactants and a product must be formed. In this case we are to find the theoretical yield of this reaction.
We have been told that the HCl is in excess thus we have the 2-methyl-2-butanol as the limiting reactant.
Mass of the solution = density * volume
Mass of the solution = 0.805 g/ml * 17.6 ml
= 14.2 g
Number of moles = mass/molar mass
= 14.2 g/88 g/mol
= 0.16 moles
Given that the reaction is 1:1, 0.16 moles of the product is obtained.
Theoretical yield = Number of moles products * molar mass of products
= 0.16 moles * 106.59 g/mol
= 17.1 g
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What pillar of sustainability is broken by recycling
electronics in India? Should the US make a law that electronics can
only be recycled in the US?
Answers
The pillar of sustainability broken by recycling electronics in India is environmental sustainability. Implementing a law that restricts electronics recycling to the US would not necessarily be the most effective solution, as it overlooks the complex global dynamics of electronic waste management.
Recycling electronics in India often involves improper disposal methods, such as burning or dismantling without proper safety measures. This leads to environmental pollution, including the release of hazardous substances into the air, soil, and water, thus violating the principle of environmental sustainability.
However, simply mandating that electronics can only be recycled in the US may not be the most optimal solution. Electronic waste is a global issue, and restricting recycling to a single country disregards the fact that electronic products are manufactured and consumed worldwide. A more comprehensive approach to addressing electronic waste would involve international cooperation, strict regulations, and monitoring of recycling practices to ensure they meet environmental standards.
Efforts should focus on improving recycling practices globally, including promoting responsible electronic waste management, developing sustainable recycling infrastructure in multiple countries, and encouraging the adoption of safe and environmentally friendly recycling practices. This approach would foster global sustainability and address the challenges associated with electronic waste disposal more effectively than a geographically limited restriction.
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B 1,6,4
D 2, 10,8
Question 2
Magnesium ribbon burns in awyren with the fame to produce a white sold.
magnesium oxide.
2.1 is the reaction between magnesium ribon and anyen a PHYSICAL OF CHEMICAL
change? Give a reason for the answer
2.2 Write down a balanced equation for the reaction between magnesium and oxygen
2.3 Use the law of conservation of mass to show that mass is conserved during the re
In QUESTION 2.2
Question 3
ablet, with a mass of 0.25 g contains mainly calcium carbonate
Answers
Is the answer help help
Which of the following BEST explains why the tectonic plates of Earth move?
Answers
Answer:
The plates can be thought of like pieces of a cracked shell that rest on the hot, molten rock of Earth’s mantle and fit snugly against one another. The heat from radioactive processes within the planet’s interior causes the plates to move, sometimes toward and sometimes away from each other.
A student weighs out 0. 0422 g of magnesium metal. The magnesium metal is reacted with excess hydrochloric acid to produce hydrogen gas. A sample of hydrogen gas is collected over water in a eudiometer at 32. 0°c. The volume of collected gas is 43. 9 ml and the atmospheric pressure is 832 mmhg. Using the experimentally collected data, calculate r and the percent error.
Answers
The value of r is 0.0868 and the error percentage is 5.78%.
The student weights 0.0422 grams of magnesium; thus, we may deduce that the magnesium he used is the mass of the magnesium over the additional mass, which is 0.024422.That is roughly equal to 0.001758.It also asserts that too much hydrochloric acid can react with magnesium, releasing hydrogen gas as a result.A sample of hydrogen gas is collected over water in a meter at a volume of 43.9 cc and a maximum pressure of 22 cc.To know more about this question, you can check:
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A symbolic way to show a chemical reaction is a chemical _____.
equation
symbol
compound
formula
Answers
Answer:
Explanation:
A symbolic way to show a chemical reaction is a chemical equation.
A chemical equation is a symbolic representation of all of the substances involved in a chemical reaction.
A gas made up of N and O contains 30.4% N. At STP (0 C and 1 atm), 4.0 g of the gas occupies a volume of 0.974 L. Calculate the molecular formula.
Answers
The molecular formula of the compound, given that the compound made up of N and O contains 30.4% N is N₂O₄
How do i determine the molecular formula of the compoundFirst, we shall obtain the molar mass of the compound. Details below:
Volume (V) = 0.974 LTemperature (T) = 0 °C = 0 + 273 = 273 KPressure (P) = 1 atmGas constant (R) = 0.0821 atm.L/mol KMass = 4.0 gMolar mass = ?The mole of the gas is obtained as follow:
PV = nRT
1 × 0.974 = n × 0.0821 × 273
Divide both sides by 24.0553
n = 0.974 / (0.0821 × 273)
n = 0.043 mole
Thus, the molar mass is obtained as:
Molar mass = mass / mole
Molar mass = 4 / 0.043
Molar mass = 93 g/mol
Next, we shall obtain the empirical formula of the compound. details below:
Nitrogen (N) = 30.4%Oxygen (O) = 100 - 30.4 = 69.6%Empirical formula =?Divide by their molar mass
N = 30.4 / 14 = 2.171
O = 69.6 / 16 = 4.35
Divide by the smallest
N = 2.171 / 2.171 = 1
O = 4.35 / 2.171 = 2
Thus, the empirical formula is NO₂
Finally, we shall obtain the molecular formula of the compound. This is shown below:
Empirical formula = NO₂Molar mass of compound = 93 g/molMolecular formula =?Molecular formula = empirical × n = mass number
[NO₂]n = 150
[14 + (2 × 16)]n = 150
46n = 93
Divide both sides by 46
n = 93 / 46
n = 2
Molecular formula = [NO₂]n
Molecular formula = [NO₂]₂
Molecular formula = N₂O₄
Thus, the molecular formula of the compound is N₂O₄
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The average atomic mass of zinc is 65.37 amu, and it's atomic number is
30. How many ELECTRONS does zinc have?
Answers
Answer:
30
Explanation:
The number of protons determines an element's atomic number and is used to distinguish one element from another. ... Together, the number of protons and the number of neutrons determine an element's mass number.
The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus. The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).
The general formula for an aldehyde is?
Answers
The general formula for an aldehyde is CnH2n+1CHO or CnH2nO.
What is aldehyde?An aldehyde is an organic chemical that contains a functional group with the formula RCH=O. The functional group (without the "R" side chain) is an aldehyde, however it can also be categorized as a formyl group. Aldehydes are widely used and serve vital roles in industry and biology.
Aldehydes have a carbon center that is linked to oxygen by a double bond, hydrogen by a single bond, and a third substituent, which is carbon or, in the case of formaldehyde, hydrogen by a single bond. The middle carbon is frequently described as sp2-hybridized. The aldehyde group is polar in several ways. The length of the C=O bond is around 120-122 picometers.
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When the correct Lewis dot structure is drawn for COH2. How many lone electron pairs are on the carbon atom
Answers
The Lewis dot structure for \(COH_2\) has two lone pairs on the carbon atom, which makes it more basic and susceptible to nucleophilic attack.
To draw the Lewis dot structure for \(COH_2\), we first need to determine the total number of valence electrons in the molecule. Carbon is in group 4 of the periodic table and has 4 valence electrons, oxygen is in group 6 and has 6 valence electrons, and hydrogen is in group 1 and has 1 valence electron. So, the total number of valence electrons in \(COH_2\) is:
4 (C) + 2 (O) + 2 (H) = 8 + 12 + 2 = 22 valence electrons
To draw the Lewis dot structure, we first place the atoms in a way that satisfies the octet rule, which states that atoms tend to form covalent bonds in such a way that they each have eight electrons in their outer shell (except for hydrogen, which only needs two). We can place the oxygen atoms on either side of the carbon atom, and connect them with single bonds. We then place the hydrogen atoms on the remaining open spots around the oxygen atoms.
O=C=O
Now, we need to add the valence electrons to the diagram. We start by placing two electrons between each atom to form the covalent bonds, and then place the remaining electrons as lone pairs around each atom.
:O=C=O:
Each oxygen atom has six electrons around it, two in the covalent bond and four as lone pairs. Each hydrogen atom has two electrons around it, one in the covalent bond and one as a lone pair. The carbon atom has four electrons around it, two in the covalent bond with the oxygen and two as lone pairs.
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Explain why all glassware must be dry and the solvent anhydrous during formation and reaction of a Grignard reaction. Explain why it is advisable to not clean your glassware with acetone before a Grignard reaction. Include balanced chemical equations in your answer. (4 pts)
Answers
Answer:
The Grignard reagent will be destroyed
Explanation:
The Grignard reaction is based on a carbanion production (RMgX). If water is present in the glassware, a reaction can take place with \(H_2O\) and the desired product will not be produced. Because an "H" would be transferred from water to the Grignard reagent. (See figure 1)
If we have acetone in the glassware we will have a similar problem. The Grignard reagent would be destroyed and the desired product will not be produced. The Grignard reagent will attack the carbon in the carbonyl group and the carbanion would disappear. (See figure 2)
What amount of heat, in KJ, would be involved in condensing 12. 9 g of ch3OH ?(hvap=38. 0 kj/mol
Answers
The amount of the heat in kJ , would be involved in the condensing 12.9v g of the CH₃OH is the 15.2 kJ.
Given that :
The mass of the CH₃OH = 12.9 g
The ΔH = 38 kJ/mol
The molar mass = 32 g/mol
The number of the moles = mass / molar mass
The number of the mole = 12.9 / 32
= 0.403 mol
The number of the moles is 0.403 mol
The amount of the heat is given as :
Q = n ΔH
Q = 0.403 × 38
Q = 15.2 kJ.
Thus, the amount of the heat is 15.2 kJ.
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Help me!!
Question 5 only!
