Question

The mass of a crucible and lid is 23.422 g. After adding a sample of hydrate compound the crucible, cover, and contents weigh 24.746 g. After heating with a Bunsen burner to remove the water of hydration, the mass of the crucible, cover, and sample was 24.213 g. How many moles of water did the hydrate compound contain

Answer 1

0.030 mole

Step-by-step explanation:

Mass of crucible + lid = 23.422 g

Mass of crucible + lid + compound = 24.746 g

Mass of crucible + lid + compound - water = 24.213

Mass of water = Mass of crucible + lid + compound + heat

= 24.746 - 24.213

= 0.533 g

Mole of water in the hydrated compound = mass of water in the compound/molar mass of water

= 0.533/18

= 0.0296 mole = 0.030 mole