Question

Two elements 'P' and 'Q' combine to form a compound. Atomic mass of 'P' is 12 and 'Q' is 16. Percentage of 'P' in the compound is 27.3. What will be the empirical formula of the compound?

• A. $P_2{Q}_2$
• B. PQ
• C. $P_{2}Q$
• D. $P{Q}_2$

Answer 1

The correct option is D $P{Q}_2$

Element	mass%	Atomic mass(g)	$\frac{mass\%}{At.mass}$	Integral ratio
P	27.3	12	2.275	1
Q	72.7	16	4.5	2

Empirical formula is $P{Q}_2$