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  4. Two elements P (atomic weight =75 ) and Q (atomic weight =16 ) combine to give a compound having 75.8 % of P. The formula of the compound is

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Q. Two elements $P$ (atomic weight $=75$ ) and $Q$ (atomic weight $=16$ ) combine to give a compound having $75.8 \%$ of $P$. The formula of the compound is

Some Basic Concepts of Chemistry

Solution:

$100\, g$ of compound contains

Moles of $P=\frac{75.8}{75} \approx 1$ ; Moles of $Q=\frac{24.2}{16} \approx 1.5$

Molar ratio of $P$ and $Q=1: 1.5$ i.e., 2: 3

: The formula of the compound is $P_{2} Q_{3}$.