Question

NTP weighs 8 grams at 5.6 liters. So find the vapor density of air.
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Answer 1

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.

Answer 2

Answer:

22.4 liter will weigh 32 grams. 22.4 liter weighs molecular mass. So molecular mass is 32 grams. As you know molecular mass = 2×vapour density,so vapour density of the gas is 16 grams.Nov 3, 2017

Explanation:

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