The atomic mass of element X is 33.42 amu. A

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I think you didn't give the question properly.

I assume that X(27.51) is combining with the Y(88.90)

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 of atomic mass / 88.90

Y's atomic mass = 88.90 * 33.42 / 27.51

Y's amu = 107.998

rounding to the nearest integer

Y's amu = 108

Hence

the atomic mass of Y =108

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