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A hypothetical compound has a formula of X2YZ3.

A hypothetical compound has a formula of X2YZ3. If the atomic masses of X, Y, and Z are 41.2, 57.7 and 63.9 respectively, calculate the % by mass of the compound. If the molecular formula is actually X6Y3Z9, what is the percentage of each element present?

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Molecular weight of X2YZ3 =2*41.2 + 57.7 + 3*63.9 = 331.8 (g)
So the % by mass ...

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