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29 September, 14:12

What is the percent by mass of water present in 1.0 mole of caso4 times 2h20?

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  1. 29 September, 15:44
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    20.9% is water

    Explanation:

    To find the % water we will have to find the mass of water and divide by the mass of the entire compound which includes the water.

    Ca 40.1 grams/mole + S 32.1 grams/mole + Oxygen 16.0 grams/mole x 4 + water 18.0 grams/mole x 2 = 172.2 grams/mole

    Since water was

    36.0

    172.2

    we get a decimal of 0.209059 which becomes 20.9% when rounded for significant figures
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