Q. How 2.02 ? Is it the mass of hydrogen? Can't we use the rounded-off value? Share with your friends Share 0 Decoder_2 answered this Dear student,Here in these type of questions we are dealing with gases not element.So here 2.02 is molecular mass of hydrogen gas.Actually Molar mass of H2 is 2.01588 ± 0.00014 g/molSo in approx we can take 2.02 as our value.We can use 2 also but 2.02 will give more precise answer.Regards 1 View Full Answer
