A gas has molecular formula (CH)n. If vapour density of the gas is 39, what should be the formula of the compound?

Question

A gas has molecular formula (CH)n. If vapour density of the gas is 39, what should be the formula of the compound? (A) C3H3 (B) C4H4 (C) C2H2 (D) C6H6

Tardigrade Admin · Accepted Answer

Mol. wt. = 2× V.D = 2×39 = 78 (CH)n = (13)n or 13× n =78 n =78/13 = 6 ∴ Molecular formula = C6H6

Q. A gas has molecular formula $(C H)_{n}$ . If vapour density of the gas is $39$ , what should be the formula of the compound?

$C_{3} H_{3}$

$C_{4} H_{4}$

$C_{2} H_{2}$

$C_{6} H_{6}$

Mol. wt. $= 2 \times V . D = 2 \times 39 = 78$
$(C H)_{n} = (13)_{n}$ or $13 \times n = 78$
$n = 78 / 13 = 6$
$∴$ Molecular formula $= C_{6} H_{6}$

Q. A gas has molecular formula (CH)n​. If vapour density of the gas is 39, what should be the formula of the compound?

C3​H3​

C4​H4​

C2​H2​

C6​H6​