# what was the mass of the hydrate sample

July 10, 2020
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July 10, 2020

a student is given a sample of a blue nickel sulfate hydrate. she weighs the sample in a dry covered crucible and obtain a mass of 23.711 g for the crucible, cover, and a sample. earlier she had found that the crucible and cover weighed 21.594 g. she then heats the crucible to drive off the water of hydration, keeping the crucicle at red heat for about 10minutes with the cover slightly ajar. She then lets the crucible cool, and finds it has a lower mass; the crucible, cover and contents then weigh 22.840 g. In process the sample was converted to greenish-yellow anhydrous NiSO4.

A) what was the mass of the hydrate sample? B) what is the mass of the anhydrous NiSO4? C) how much water was driven off? D) what is the percent by mass of water in the hydrate? E) how many grams of water would there be in 100.0 g hydrate? How many moles?

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