WorksheetsUnit 4 Review
Total questions: 25
Worksheet time: 1hrs 15mins
What is the molar mass of (NH₄)₂CO₃?
96
44
60
84
What is the total mass, in grams, of 0.75 mole of SO₂?
48
32
64
24
What is the total number of moles represented by 20 grams of CaCO₃?
0.2
2.0
0.5
1.0
What is the approximate mass of one mole of chlorine gas (Cl₂)?
17.5 g
35 g
71 g
71 mol
Which of the following is the correct unit for the mass of one mole of a substance?
N
mol
g
m
If the atomic mass of chlorine (Cl) is approximately 35, what reasoning explains why the mass of one mole of Cl₂ is about 71 g?
Because Cl₂ is a compound of two different elements
Because the mass of Cl₂ is double the atomic mass of Cl
Because the atomic mass of Cl is rounded up
Because Cl₂ contains one atom of chlorine
What is the molar mass of potassium chloride, KCl?
32.3 amu
74.6 amu
149.2 amu
154.5 amu
What is a mole in chemistry terms?
a mammal found in Eurasia and North America
an SI unit for measuring the amount of a substance
a benign tumor sometimes found on human skin appearing as a small, sometimes raised area of skin, usually with darker pigment
a Mexican sauce made from chili peppers, other spices, and chocolate
What is the molar mass of carbon?
6.0 g/mol
12.0 g/mol
22.4 g/mol
6.02 x 10^23 g/mol
Which of the following conversions is correct?
1 mole of CO₂ = 44 grams of CO₂
1 mole of NaCl = 58 grams of NaCl
Both of the conversions are correct.
Neither conversion is correct.
Which of the following statements about a mole is incorrect?
One mole of a substance always contains 6.022 x 10²³ particles.
One mole of a substance always has the same mass, regardless of the substance.
The mole is a standard unit in the International System of Units (SI).
The number of particles in a mole is constant, but the mass of a mole depends on the substance.
What is the approximate percent by mass of potassium in KHCO₃?
39
25
50
10
What is the percent composition of carbon in acetic acid (CH₃COOH)?
40.0%
41.4%
20.0%
33.3%
What is the molecular formula of a compound that has a molecular mass of 42 amu and an empirical formula of CH₂?
C₄H₁₂
C₂H₄
C₃H₆
CH₂
The empirical formula of a compound is CH2. The molecular formula of this compound could be –
C₃H₆.
C₂H₆.
CH₄.
C3H₄.
A compound has the empirical formula NO₂. Its molecular formula could be –
N₄O₂.
N₂O4.
NO.
N₄O₄.
Which formulas could represent the empirical formula and the molecular formula of a given compound?
CH₄, C₅H₁₂
CH₂, C₃H₆
CH₂O, C₄H₆O₄
CHO, C₆H₁₂O₆
Which formula is both a molecular and an empirical formula?
C₄H₈
C₃H₈O
C₆H₁₂O₆
C₂H₄O₂
Calculate the molar mass of Mg(OH)2.
33.2 g/mol
41.3 g/mol
86.9 g/mol
58.3 g/mol
To melt the ice, Juan throws 455 g of calcium chloride, CaCl2 on his sidewalk. How many moles of CaCl2 did he throw?
50,500 moles
4.10 moles
7.56 x 10-22 moles
111 moles
Of the chemical formulas listed below, which formula is written in empirical formula?
P4O10
C5H11
N2O4
C6H18O3
