1. An easier way could be, as I think:
29.8 (kJ/g) x 46 (g/mole) = .... (kJ/mole);
I don't understood wherefrom you introduced all data: 3231kJ + 1488kJ --> 2972kJ + 2778kJ ??
2. Here we have the reverse: 297 kJ/ mole S.
But 1 mole S weight 32 g. 1.6g mean 1/20mole, i.e. the energy shall be 297/20= ...kJ.
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