Single Choice

A certain compound has the molecular formula $$X_4O_6$$. Find the atomic mass of X if $$10$$ g of $$X_4O_6$$ has $$5.72$$ g X.

A$$32 amu$$
Correct Answer
B$$37 amu$$
C$$42 amu$$
D$$98 amu$$

Solution

$$\dfrac {\text {Molecular weight of}X_4O_6}{\text {Atomic weight of 4 X}}=\dfrac {\text {Weight of}X_4O_6}{\text {Weight of X}}$$

$$\implies \dfrac {4x+96}{4x}=\dfrac {10}{5.72}$$

$$\therefore x=32$$ g

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