Chemistry 51 - Fundamentals of Chemistry » Fall 2021 » Chapter 6 Homework
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Question #1
One mole of carbon has a mass equal to one mole of oxygen.
A.
FALSE
B.
TRUE
Question #2
One mol of Na2SO4 has twice the number of oxygen atoms as sodium atoms.
A.
TRUE
B.
FALSE
Question #3
Given the balanced chemical reaction C5H12 + 8O2 → 5CO2 + 6H2O, the number of moles of water molecules that can be formed when 12 moles of O2 are reacted is 9.
A.
FALSE
B.
TRUE
Question #4
The molar mass of Cl2 is 35.45 g/mol.
A.
FALSE
B.
TRUE
Question #5
The coefficients in a balanced chemical reaction show the mass ratios of the substances, which are necessary to do correct stoichiometry calculations.
A.
FALSE
B.
TRUE
Question #6
Consider the formation of ammonium chloride given by the equation: NH3 + HCl → NH4Cl. How many grams of HCl would fully react with 76.43 moles of ammonia?
A.
2787
B.
1302
C.
4088
D.
4071
E.
2709
Question #7
Consider the reaction: Na2CO3 + 2HCl → 2NaCl + CO2 + H2O. A minimum of _____ moles of sodium carbonate is needed to fully react with 750 g of HCl.
A.
10
B.
5.2
C.
53
D.
21
E.
110
Question #8
How many moles of carbon are produced when 1745 g of sugar react according to the equation C6H12O6 + H2SO4 → 6C + 6H2O?
A.
6.026
B.
58.12
C.
365.8
D.
1081
E.
72.12
Question #9
How many moles of HNO3 are present in 697 g of HNO3?
A.
10.9 moles
B.
32.3 moles
C.
14.3 moles
D.
11.1 moles
E.
17.2 moles
Question #10
How many moles of hydrogen atoms are present in 27 grams of H2O?
A.
Approximately one
B.
Approximately two
C.
Approximately one and a half
D.
Approximately two and a half
E.
Approximately three
Question #11
How many moles of hydrogen atoms are present in 34.2 moles of C6H5CHO?
A.
68.4
B.
205.2
C.
34.2
D.
102.6
E.
171
Question #12
If a sample contains 13.56 mol of Na2SO4, how many moles of sodium atoms does it have?
A.
26.45
B.
13.56
C.
54.24
D.
27.12
E.
40.68
Question #13
In the reaction H2SO4 + 2NaOH → Na2SO4 + 2H2O, the number of moles of H2O that can be produced from 10 moles of NaOH is _____.
A.
5
B.
20
C.
10
D.
2
E.
3
Question #14
One mole of oxygen molecule contains how many atoms of oxygen?
A.
1.204 × 1024
B.
1.6021 × 10–19
C.
6.022 × 1023
D.
1.6021 × 10+19
E.
6.022 × 10–23
Question #15
Three moles of (NH4)2Fe(SO4)2·6H2O contains _____ moles of H2O.
A.
12
B.
6
C.
9
D.
18
E.
3
Question #16
What is the molar mass of MgCO3?
A.
56.93 g/mol
B.
84.31g/mol
C.
71.17 g/mol
D.
36.31 g/mol
E.
85.76 g/mol
Question #17
What is the relationship between the atomic mass of oxygen and the molecular mass of elemental oxygen?
A.
They are the same.
B.
The atomic mass is twice the molecular mass.
C.
There is no relationship because they are different substances.
D.
The relationship depends on the composition of elemental oxygen.
E.
The molecular mass is twice the atomic mass.
Question #18
If a sample consists of two moles of ethanol (C2H6O), the number of moles of carbon atoms is _______.
A.
1
B.
6
C.
2
D.
4
Question #19
A sample of gold contains 14.04 × 1024 atoms. This corresponds to _______ moles of gold. Report your final answer to 1 decimal place.
A.
23
B.
23.3
C.
24.4
D.
22.1
Question #20
If a sample contains 6.75 mol of Na2SO4, it has _______ moles of sodium atoms. Report your final answer to 1 decimal place.
A.
15
B.
13.5
C.
14.5
D.
16.5
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