Question

If the volume of 22g of gas is 11.2 L at NTP. Then find out the molecular weight of
gas :-
22
44
88
11.2​

Answer 1

Answer:

option b

Explanation:

given mass / mol mass = no. of moles

also,

volume of gas at NTP / 22.4 litres = no. of moles

then equating both..

given mass - 22 grams

given volume - 11.2 litres

given mass/ mol. mass = given vol. at NTP / 22.4

22/ Mol mass = 11.2/ 22.4

molecular mass = 2 × 22 = 44 gram

Answer 2

Answer:

The molecular weight of gas at NTP is $44g/mol$.

Therefore, option b) $44g/mol$ is the correct choice.

Explanation:

Given,

The volume of gas at NTP = $11.2 l$

Here, NTP is normal temperature and pressure

The mass of gas = $22g$

The molecular weight of gas =?

As we know,

• 1 mole of gas at NTP occupies $22.4l$ of gas

Therefore,

• Number of moles = $\frac{V_{1} }{22.4}$

Here,

• V₁ = Volume of given gas at NTP

Therefore,

• Number of moles = $\frac{11.2}{22.4}$ = $0.5 mol$

Also,

• Number of moles = $\frac{Given mass}{Molar mass}$

After putting the values in the equation, we get:

• $0.5 = \frac{22}{Molar mass}$
• Molar mass = $44g/mol$.

Hence, the molecular weight of gas = $44g/mol$.