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29 December, 19:31

Suppose there are two known compounds containing the generic elements X and Y. You have a 1.00-g sample of each compound. One sample contains 0.30 g of X and the other contains 0.39 g of X. Identify plausible sets of formulas for these two

compounds.

XY and X3Y

X3Y and X4Y

XY3 and XY4

X2Y and X3Y

X4Y2 and X3Y

X2Y5 and X3Y5

XY and X2Y

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Answers (1)
  1. 29 December, 22:11
    0
    To solve this, we must remember that the number of moles in each formula must a whole number.

    So we are given two X’s:

    X = 0.3

    X = 0.39

    We divide the two by the smallest X, so divide by 0.3:

    X = 0.3 / 0.3 = 1

    X = 0.39 / 0.3 = 1.3

    However the second X is not a whole number yet, therefore multiply the two X’s by 3 to make them whole numbers:

    X = 1 * 3 = 3

    X = 1.3 * 3 = 4

    So the X’s must be: X3 and X4 and based from the choices, the answer is:

    X3Y and X4Y
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