Question

what is the difference between the pair propane and butane can you find out the difference in molecular masses between these pairs

Answer 1

Different in molecular mass is 14u

Answer 2

Propane contains 3 carbon atoms, 8 hydrogen atoms and 10 single bond whereas butane contains 4 carbon atoms , 10 hydrogen atoms with 13 single bonds.

The difference in their molecular mass is 17u.