Unit 4 Review

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

Tags

NGSS.HS-PS1-7

Which of the following is the correct unit for the mass of one mole of a substance?

• N

• mol

• g

• m

Tags

NGSS.HS-PS1-7

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

Tags

NGSS.HS-PS1-7

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.