Map University Science Books eneral Chemist presented by Sapling Lea Donald McQu

Question

Map University Science Books eneral Chemist presented by Sapling Lea Donald McQuarrie .Peter A. Rodk. Ethan Gallogly A85.2-mg sample of the compound Xeo Contains 48.0 mg of oxygen atoms. What is the atomic mass of element X? Number amu O Previous Give Up & View Solution 2 Check Answer Next Exit Hint Let x be the atomic mass of X. Write a formula for the mass fraction of oxygen in this compound in terms of x. Multiplying the mass of the sample by the mass fraction of oxygen gives the mass of oxygen. Write out that equality, then solve for x,

Explanation / Answer

let x be the molar mass of X
mass fraction of O = 10 * molar mass of O / (mass of X4O10)
mass fraction of O = 10 * molar mass of O / (10 * molar mass of O+4*x)
0.048 = 10*16/(10*16+4*x)
(10*16+4*x) = 3333.33
x = 793.3 gm

Atomic mass of X will be 793.3 amu

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