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Laws of Definite Proportions, Multiple Proportions

5.0 g of a ce...

Question

5.0 g of a certain element X forms 10.0g of its oxide having the formula $X_{4} O_{6}$ . The atomic mass of X is ?

A

12.0 amu

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B

24.0 amu

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C

30.0 amu

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D

32.0 amu

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Solution

The correct option is B
24.0 amu

Using the relationship
$\frac{M o l m a s s o f o x i d e}{M a s s o f m e t a l i n i n m o l a r m a s s} = \frac{m a s s o f o x i d e}{m a s s o f m e t a l}$
$\frac{4 x + 96}{4 x} = \frac{10}{5} \Rightarrow x = 24$

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5.0 g of a certain element X forms 10.0g of its oxide having the formula $X_{4} O_{6}$ . The atomic mass of X is ?

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