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Question

A certain compound has the molecular formula, X4O6. If 10 g of compound contains 5.62 g of X, the atomic mass of X is approximately :

A
32 amu
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B
30.8 amu
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C
42 amu
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D
48 amu
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Solution

The correct option is A 30.8 amu
10 g of X4O6 contains 5.62 g of X.

So, the weight of O is 105.62=4.38g.

Now, as weightatomicmass= number of atoms in given formula,

So, WeightofXatomicmassofX : WeightofOatomicmassofO=4:6

Let atomic mass of X be x.

5.62x : 4.3816=4:6

5.62×164.38x=46

5.62×16×64=4.38x

So, x=30.8amu.

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