An 8.10-g sample of hydrated magnesium carbonate is heated. It has a mass of 4.94 g after heating. What is the percentage by mass of water in the hydrate? 3.16% 17.6% 39.0% 61.0%

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asked Jan 14, 2018 15.7k views

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An 8.10-g sample of hydrated magnesium carbonate is heated. It has a mass of 4.94 g after heating. What is the percentage by mass of water in the hydrate?

3.16%
17.6%
39.0%
61.0%

Chemistry
high-school

Ken Shiro asked

by Ken Shiro

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C or 3rd option: 39.0%

JSEvgeny answered Jan 15, 2018

by JSEvgeny

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2 votes

8.10-4.94=3.16=mass of water
3.16/8.10 X 100 = 39.0%

NathanBrakk answered Jan 18, 2018

by NathanBrakk

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