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

Question

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 (A) P3 Q2 (B) P3 Q (C) P Q3 (D) P2 Q3

Tardigrade Admin · Accepted Answer

100 g of compound contains Moles of P=(75.8/75) ≈ 1 ; Moles of Q=(24.2/16) ≈ 1.5 Molar ratio of P and Q=1: 1.5 i.e., 2: 3: The formula of the compound is P2 Q3.

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

$P_{3} Q_{2}$

$P_{3} Q$

$P Q_{3}$

$P_{2} Q_{3}$

$100 g$ 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 $P_{2} Q_{3}$ .

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

P3​Q2​

P3​Q

PQ3​

P2​Q3​