Question

Five litre of a gas at s.t.p weighs 18 g.Calculate the molecular weight of the gas if one litre of hydrogen gas weighs 0.1g​

Answer 1

Answer:

Any gas can be identified from its molecular weight.

VolumeoccupiedbythegasattheS.T.P.=22.4litres

Massofthegas=1.6g.

Molecularweight=?

Terms involved in the problems are weight and volume of gas at S.T.P.

The standard relation connecting the above two terms is:

GMWofanygasoccupies22.4litresatS.T.P.

2.24litresofthegivengasatS.T.P.weigh1.6g.

22.4litresofanygasatS.T.P.weighGMW

⇒GMW=2.241.6×22.4=16g

⇒Molecularweight=16.

Therefore, the molecular weight of the gas is 16 and the gas is methane (CH4)