How many kJ of heat are released when 15.75 g of Ba reacts completely with oxygen to form BaO?

The enthalpy for the reaction below is -1107 kJ.



2Ba(s) +O2(g) --> 2BaO(s)

Group of answer choices

20.8

63.5

114

70.3

127

2 answers

Enthalpy released is 1107 for this reaction.
2Ba(s) +O2(g) --> 2BaO(s) so that is 1107/2 for this reaction:
Ba(s) + 1/2 O2(g) --> BaO(s) dH = -553.5 kJ for 137.3 kJ so for 15.75 g Ba it will be
553.5 kJ x (15.75/137.3) = ?
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