The atomic mass of element X is 33.42 amu. A 27.51-g sample of X combines with 88.90 g of another element Y to form a compound XY. Calculate the atomic mass of Y.

We use the ratio to solve this.

Atomic mass of X / 27.51-g of X = Y(amu) / 88.90-g of Y

Then, we get

33.42 / 27.51 = Y(amu) / 88.90Y(amu) = 88.90 * 33.42 / 27.51Y(amu) = 2971.038 / 27.51Y(amu) = 107.998HenceY(amu) = 108

33.42 / 27.51 = Y(amu) / 88.90

Y(amu) = 88.90 * 33.42 / 27.51

Y(amu) = 2971.038 / 27.51

Y(amu) = 107.998

Hence

Y(amu) = 108

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