Which energy profile best shows that the triangle Hf of H2S is -20.6 kJ/mol

The molas mass of Ba(MnO4)2 is 375.21 g/m
So what’s next it’s a simple stoichiometry conversion:)
We start with what’s given: 13.25 g and because we want to convert to moles moles will be on top and grams on the bottom. We will end up dividing 13.25 by 375.21; this gives us 0.0353 mol Ba(MnO4)2