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
the atomic mass of Y =108
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