Question

Mass of 122ml of a certain gas is 0,22 g at STP,how many molecule are there in the sample of gas ? What is the molar mass of the gas

Answer 1

Answer:

Volume= 112ml=0.112litre

Pressure= 3.8×10  

−1

torr=0.0005atm

T=0  

o

C=273K

PV=nRT

⇒n=  

0.0821×273

0.0005×0.112

​  

=2.498×10  

−6

 moles

The number of molecules of the gas remaining in the tube= 2.4018×10  

−6

×6.023×10  

23

=1.5×10  

18

 

Explanation: