WorksheetsAP 1.1 Moles and Molar Mass
Total questions: 20
Worksheet time: 12mins
Name
Class
Date
1.
What is the molar mass of Hydrogen Peroxide (H₂O₂)?
a)
34.02 g/mole
b)
36.5 g/mole
c)
48 g/mole
d)
35.5 g/mole
2.
How many moles are in 16.94g of water?
a)
16.94 mol H2O
b)
305.3 mol H2O
c)
1.063 mol H2O
d)
0.9401 mol H2O
3.
What is the mass in grams of 5.90 mol C₈H₁₈?
a)
673 g
b)
389 g
c)
19.4 g
d)
.0512 g
4.
How many moles are in 19.82 g Mg?
a)
0.8156 mol Mg
b)
1.226mol Mg
c)
481.7mol Mg
d)
1.000mol Mg
5.
What is the mass in grams of 2.3456 moles of W?
a)
486.01 grams
b)
207.2 grams
c)
6.02 grams
d)
431.22 grams
6.
What is the molar mass of one mole of HCl?
a)
35.45 grams per mole of HCl
b)
36.46 grams per mole of HCl
c)
1.01 grams per mole of HCl
d)
79.92 grams per mole of HCl
7.
What is the molar mass of glucose, C₆H₁₂O₆?
a)
18 g
b)
160.00 g
c)
12.01 g
d)
220.17 g
e)
180.18 g
8.
Butane, CH3-CH2-CH2-CH3, is a hydrocarbon fuel used in lighters. How many moles of molecules are there in a 350. gram sample of butane?
a)
20300 mol
b)
6 mol
c)
6.02 mol
d)
20349 mol
e)
0.170 mol
9.
How grams of oxygen are present in a 30.0 gram sample of potassium chlorate?
a)
3.83 grams
b)
11.8 grams
c)
150.45 grams
d)
7.83 grams
e)
36.8 grams
10.
According to the information in the table below, a 1.00 g sample of which of the following contains the greatest mass of oxygen?
a)
Na2O
b)
MgO
c)
K2O
d)
CaO
11.
Given that the density of Hg(l) at 0°C is about 14 g mL-1, which of the following is closest to the volume of one mole of Hg(l) at this temperature?
a)
0.070 mL
b)
0.14 mL
c)
1.4 mL
d)
14 mL
e)
28 mL
12.
A student has a 1g sample of each of the following compounds: NaCl , KBr , and KCl . Which of the following lists the samples in order of increasing number of moles in the sample?
a)
NaCl < KCl < KBr
b)
NaCl < KBr < KCl
c)
KCl < NaCl < KBr
d)
KBr < KCl < NaCl
13.
A student obtains a sample of a pure solid compound. In addition to Avogadro’s number, which of the following must the student know in order to determine how many molecules are in the sample?
a)
Mass of the sample, volume of the sample
b)
Mass of the sample, density of the sample
c)
Molar mass of the compound, mass of the sample
d)
Molar mass of the compound, density of the sample
14.
A solution of methanol, CH₃OH, in water is prepared by mixing together 128 g of methanol and 108 g of water. The mole fraction of methanol in the solution is closest to
a)
0.80
b)
0.60
c)
0.50
d)
0.40
e)
0.20
15.
In 1.00 mol of potassium zirconium sulfate trihydrate, K₄Zr(SO₄)₄ • 3 H₂O, there are
a)
3 × 6.02E23 hydrogen atoms
b)
6.02E23 sulfur atoms
c)
4 × 6.02E23 potassium atoms
d)
4 moles of oxygen atoms
e)
4 moles of zirconium atoms
16.
How many carbon atoms are contained in 2.8 g of C₂H₄ ?
a)
1.2E23
b)
3.0E23
c)
6.0E23
d)
1.2E24
e)
6.0E24
17.
Which of the following numerical expressions gives the number of particles in 2.0g of Ne?
a)
(6.0E23particles/mol) / 2.0g
b)
6.0E23particles/mol / 20.18g/mol
c)
(2.0g / 20.18g/mol) (6.0E23particles/mol)
d)
(20.18g/mol / 2.0g) (6.0E23particles/mol)
18.
What number of moles of O₂ is needed to produce 14.2 grams of P₄O₁₀ from P? (Molecular weight P₄O₁₀ = 284)
a)
0.0500 mole
b)
0.0625 mole
c)
0.125 mole
d)
0.250 mole
e)
0.500 mole
19.
What is the mass of one mole of aluminum chloride (remember to determine the correct formula first)?
a)
62.435g
b)
116.399g
c)
133.341g
d)
97.888g
20.
Calculate the molar mass of Mg(OH)2.
a)
33.2 g/mol
b)
41.3 g/mol
c)
86.9 g/mol
d)
58.3 g/mol
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