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Worksheet: Moles, Mass, and Formula Mass

Q1:

Sulfuric acid has a relative formula mass of 98 g/mol. What is the mass of 2.5 mol of sulfuric acid, to 3 significant figures?

Q2:

Ammonia has a relative formula mass of 17. How many moles of ammonia molecules are there in 34 g of ammonia?

Q3:

A 24 g sample of lithium hydride contains 3.0 moles of L i H units. What is the relative formula mass of lithium hydride?

Q4:

What is the mass of 0.443 mol of hydrazine, N H 2 4 ?