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A sample of a hydrate has a mass of 5.026 g. After it is heated, it has a mass of 3.492 g. What is the percentage by mass of water in the hydrate? 1. 19.40% 2. 27.92% 3. 30.52% 4. 69.48%
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A sample of a hydrate has a mass of 5.026 g. After it is heated, it has a mass of 3.492 g. What is the percentage by mass of water in the hydrate?

1. 19.40%
2. 27.92%
3. 30.52%
4. 69.48%

User Sebastian Heikamp
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9.1k points

1 Answer

5 votes
hydrate has a mass of 5.026 g
After it is heated, it has a mass of 3.492 g, that means the mass of water is
mH2O=5.026-3.492=1.534g
using the main formula
%H2O= (mass of water / mass of hydrate ) x100= 30.52%
the answer is 3. 30.52%
User Keerz
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8.5k points
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