IB Moles Quiz

What is the molar mass of H2O?

• 16

• 20

• 22

• 18

How many moles are there in 25 grams of NaCl?

• 0.625

• 0.428

• 0.25

• 1.25

In the reaction 2H2 + O2 -> 2H2O, what is the mole ratio of H2 to H2O?

• 2:1

• 1:2

• 1:1

• 3:1

What is the empirical formula of a compound that contains 40% carbon, 6.7% hydrogen, and 53.3% oxygen?

• CHO2

• C2H4O2

• C3H6O3

• CH2O

What is the molar volume of a gas at STP?

• 1.5 liters per mole

• 10 liters per mole

• 50 liters per mole

• 22.4 liters per mole

Calculate the molar mass of CO2.

• 44.01

• 55.01

• 33.01

• 22.01

How many moles of H2O are produced when 4 moles of O2 react?

• 10

• 2

• 8

• 6

In the reaction 2H2 + O2 -> 2H2O, how many moles of O2 are needed to produce 6 moles of H2O?

• 4

• 1

• 2

• 3

A compound contains 52.2% carbon, 13.0% hydrogen, and 34.8% oxygen. What is its empirical formula?

• C2H5O

• C2H6O

• C3H6O

• C2H4O

What is the molar volume of a gas at 25 degrees Celsius and 1 atm pressure?

• 24.79

• 10.00

• 50.00

• 25.00