Worksheet: Reaction Masses from Formula Mass Ratios

In this worksheet, we will practice calculating the masses of reactants and products using the ratios of their relative formula masses.

Q1:

Methane burns in oxygen according to the following equation:

What is the molar ratio of methane to oxygen?

  • A 1 1
  • B 4 1
  • C 1 4
  • D 1 2
  • E 2 1

What is the molar ratio of methane to carbon dioxide?

  • A 1 4
  • B 2 1
  • C 1 2
  • D 1 1
  • E 4 1

What is the molar ratio of oxygen to water?

  • A 1 4
  • B 1 1
  • C 4 1
  • D 2 1
  • E 1 2

Q2:

Methane burns in oxygen according to the equation: The molar mass of methane is 16 g/mol, and the molar mass of molecular oxygen is 32 g/mol.

What is the ratio of the molar masses of methane and oxygen?

  • A 1 1
  • B 1 4
  • C 4 1
  • D 1 2
  • E 2 1

What is the ratio of the mass of methane to the mass of oxygen in this reaction?

  • A 2 1
  • B 1 4
  • C 1 1
  • D 1 2
  • E 4 1

What mass of oxygen is needed to for 1 g of methane to completely react?

Q3:

Sodium oxide reacts with hydrochloric acid to produce sodium chloride and water, according to the equation:

What is the molar ratio of N a O 2 to H C l ?

  • A 1 2
  • B 1 4
  • C 1 1
  • D 4 1
  • E 2 1

What is the molar mass of N a O 2 to two significant figures?

What mass of H C l is required for 2.5 g of N a O 2 to completely react?

Q4:

Carbon tetrachloride can be synthesized by reacting chlorine with methane according to the equation: If 8.0 g of H C l is produced, what mass of methane is consumed?

Q5:

Butane burns completely in oxygen according to the equation: If 44 g of carbon dioxide is produced in this reaction, how much oxygen is consumed?

Q6:

Magnesium and chlorine react together vigorously, producing magnesium chloride according to the following equation:

What is the relative atomic mass of magnesium, to the nearest gram per mole?

How many moles of magnesium atoms are there in 6.0 g of magnesium?

How many moles of magnesium chloride are produced when 6.0 g of magnesium reacts completely with chlorine?

What is the relative formula mass of magnesium chloride, to the nearest gram per mole?

How many grams of magnesium chloride are produced when 6.0 g of magnesium reacts completely with chlorine?

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