When 5.50 g of Ba(s) is added to 100.00 g of water in a container open to the atmosphere, the reaction shown below occurs and the temperature of the resulting solution rises from 22.00°C to 61.16°C. If the specific heat capacity of the solution is 4.18 J/(g∙°C), calculate ΔHrxn for the reaction, as written.
Ba(s) + 2 H2O(l) → Ba(OH)2(aq) + H2(g) ΔHrxn = ?
A) –431 kJ
B) –3.14 kJ
C) +3.14 kJ
D) +431 kJ
E) –17.2 kJ
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