Question

Atomic mass of element P and Q are 20 and 30 respectively. Vapour density of a compound having empirical formula PQ2 is 80 then it's molecular formula will be
O P Q6
OPQs
OPQ,
OPQ4
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Answer 1

Answer:

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Answer 2

Answer:

The molecular formula of PQ₂ is P₂Q₄.

Explanation:

Given,

The atomic mass of P (Mp) = 20

The atomic mass of Q (Mq) = 30

The Vapour density(VD) of a compound having the empirical formula PQ₂ is 80.

To find,

The molecular formula of P and Q.

Calculation,

First, we calculate the atomic mass of the empirical formula PQ₂.

i.e. atomic mass of PQ₂ = atomic mass of P + 2(atomic mass of Q)

The molecular mass of PQ₂ = 20 + 2(30)

The molecular mass of PQ₂ = 80

Now as clearly we can see that the atomic mass of PQ₂ is equal to the vapor density of PQ₂. Then:

The molecular formula of PQ₂  = 2 × PQ₂ = P₂Q₄.

Therefore, the molecular formula of PQ₂ is P₂Q₄.

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