Chemistry 5th 6 weeks test reveiw

What is the formula mass of potassium chloride, KCl?

• 32.3 amu

• 74.6 amu

• 149.2 amu

• 154.5 amu

What is the molar mass of CO2?

• 22.0 g/mol

• 28.0 g/mol

• 44.0 g/mol

• 56.0 g/mol

What is the molar mass of KBr?

• 54.0 g/mol

• 74.1 g/mol

• 119 g/mol

• 1.20 X 10^24 g/mol

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

How many Carbon atoms are present in 1.00 mole of methane, CH4?

• 3.01 x 10^23

• 12.04 x 10^23

• 6.02 x 10^23

• 6.02 x 10^25

Which would have more atoms?

• 1 mol of Li

• 1 mol of Au

• 1 mol of S

• None, all are equal

How many molecules are in 2.50 moles of H₂O?

• 1.51 X 10²⁴ molecules of H₂O

• 4.15 X 10²⁴ molecules of H₂O

• 3.01 X 10²⁴ molecules of H₂O

• 8.31 X 10²⁴ molecules of H₂O

How many moles are there in 8.50 X 10²⁴ molecules of sodium sulfate, Na₂SO₃?

• 1.40 moles

• 14.1 moles

• 51.2 moles

• 5.12 X 10⁴⁸ moles

What is the mass percent of carbon in glucose, C₆H₁₂O₆?

• 25.00% C

• 40.00% C

• 41.40% C

• 72.07% C

A compound is found to have an empirical formula of CH₂O. What is the molecular formula when the molecular weight is 180.0 grams?

• C₂H₄O₂

• C₆H₈O₆

• C₆H₁₂O₆

• C₁₂H₂₄O₁₂