Question

Mass of 112 ML of abcartin gas is 0'22 g at STP?how many molecules are there in the sample of gas? What is the molar mass of the gas?

Answer 1

Answer:

6.022×10²³ molecules and 44g

Explanation:

We know at STP one mole of any gas occupies 22.4 litres of volume.

Now , Mass of 112ml of gas = 0.22g

Therefore, mass of 22400 ml of gas = 44g

Therefore, Molar mass of gas = 44g

And , No. of molecules of gas = 6.022×10²³

Answer 2

Given :-

Volume = 112ml = 0.112L

Mass = 0.22g

To Find :-

Number of molecules

Molar mass

Solution :-

We know :-

No of moles = Volume/Molar volume

No of moles = 0.112/22.4

No of moles = 5 × 10^-3

Number of molecules = Avogadro number × No of moles

Number of molecules = 6.022 × 10^23 × 5 × 10^-3

Number of molecules = 30.11 × 10^20

Molar mass = Given mass/No of moles

Molar mass = 0.22/5×10^-3

Molar mass = 0.044 × 10^3

Molar mass = 44g