Problem: 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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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 Δrxn for the reaction, as written.

            Ba(s) + 2 H2O(l)  →  Ba(OH)2(aq) + H2(g)              Δrxn = ?

A) –431 kJ          

B) –3.14 kJ         

C) +3.14 kJ       

D) +431 kJ          

E) –17.2 kJ

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