Have you used density tables?
It's a fairly simple question. If 100 g of the soln contains 60.16 g of H2
and 100 mL of the solution contains 90.24 g of H2
, all one needs to find out is how many mL of soln corresponds to 60.16 g H2
, because this volume of soln which corresponds to 60.16 g of H2
, also weighs 100 g (given).