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4 February, 16:01

If the crucible originally weighs 3.715 g and 2. 000 g of hydrate are added to it, what is the weight of the water that is lost if the final weight of the crucible and anhydrous salt is 5.022?

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  1. 4 February, 19:43
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    For this, you need to know 1) the mass of the hydrate and 2) the mass of the anhydrous salt. Once you have both of these, you will subtract 1) from 2) to find the mass of the water lost.

    From the problem, you know that 1) = 2.000 g.

    Now you need to find 2). You know that your crucible+anhydrous salt is 5.022 g. To find just the anhydrous salt, subtract the mass of the crucible (3.715 g).

    1) = 5.022 g - 3.715 g = 1.307 g

    Now you can complete our original task.

    Mass H2O = 2) - 1) = 2.000 g - 1.307 g = 0.693 g.
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