Data: SO2(g) + ½O2(g) --> SO3(g), ΔH = -99.1 kJ
Given the above data, calculate the enthalpy change ΔH when 89.6 g of SO2 is converted to SO3.

I feel this problem is easy but im missing something
someone help!

Delta H is -99.1 kJ when you convert 1 mol of SO2 to SO3.

One mol of SO2 is 64 gm. You are converting 89.6 gm.

-99.1 kJ * (89.6 gm /64 gm) = ?? kJ