Question

NTP weighs 8 grams at 5.6 liters. So find the vapor density of air.
(1) 32
(2) 40
(3) 16
(4) 8​

Answer 1

1

Explanation:

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Answer 2

GivEn:-

• At ntp 5.6 litre of a gas weight 8 gram.

To find:-

• Vapour density of air.

SoluTion:-

As we know that,

$\dag\;{\underline{\boxed{\bf{\pink{Mole = \dfrac{GivEn\;Volume}{22.4}}}}}}$

$:\implies\sf \cancel{ \dfrac{5.6}{22.6}}$

$:\implies\sf \dfrac{1}{4}$

We also know that,

$\dag\;{\underline{\boxed{\bf{\purple{Mole = \dfrac{GivEn\;Mass}{Molecular\;Mass}}}}}}$

$:\implies\sf \dfrac{1}{4} = \dfrac{8}{Molecular\;Mass}$

$:\implies\sf \dfrac{1}{4 \times 8} = \dfrac{1}{Molecular\;Mass}$

$:\implies\bf Molecular\;Mass = 32g$ ★

By the formula,

$\dag\;{\underline{\boxed{\bf{\blue{Molecular\;Mass = 2 \times Vapour\; Density}}}}}$

$:\implies\sf 32 = 2 \times Vapour\; Density$

$:\implies\sf \cancel{ \dfrac{32}{2}} = Vapour\;Density$

$:\implies\bf Vapour\; Density = 16$ ★

$\dag$ Hence, Vapour density of air is 16.

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