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11 August, 11:35

Copper (II) sulfate pentahydrate, CuSO4 ·5 H2O, (molar mass 250 g/mol) can be dehydrated by repeated heating in a crucible. Which value is closest to the percentage mass of water lost from the total mass of salt in the crucible when the crucible undergoes repetitive heatings until a constant mass is reached?36%26%13%25%

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  1. 11 August, 11:41
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    The water lost is 36% of the total mass of the hydrate

    Explanation:

    Step 1: Data given

    Molar mass of CuSO4*5H2O = 250 g/mol

    Molar mass of CuSO4 = 160 g/mol

    Step 2: Calculate mass of water lost

    Mass of water lost = 250 - 160 = 90 grams

    Step 3: Calculate % water

    % water = (mass water / total mass of hydrate) * 100 %

    % water = (90 grams / 250 grams) * 100% = 36 %

    We can control this by the following equation

    The hydrate has 5 moles of H2O

    5*18. = 90 grams

    (90/250) * 100% = 36%

    (160/250) * 100% = 64 %

    The water lost is 36% of the total mass of the hydrate
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