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24 August, 19:25

A 12.2-g sample of x reacts with a sample of y to form 78.9g of xy. what is the mass of y that reacted?

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  1. 24 August, 20:24
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    The chemical reaction would most likely be written as:

    X + Y = XY

    We cannot simply use the usual method of converting grams to moles since we do not have any idea on what are the identities of X and Y. The only method we could use is to use the law of conservation of mass where mass inflow in a process should be equal to the mass out in the process. The total inflow of mass would be the mass of X and Y and the outflow would be the product XY.

    g X + g Y = g XY

    12.2 g + g Y = 78.9 g XY

    g Y = 66.7 g
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