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A sample of K(s) of mass 3.162 g undergoes combustion in a constant volume calorimeter at...

A sample of K(s) of mass 3.162 g undergoes combustion in a constant volume calorimeter at 298.15 K. The calorimeter constant is 1849 J⋅K−1, and the measured temperature rise in the inner water bath containing 1508 g of water is 1.776 K. CP,m(H2O,l)=75.3J⋅mol−1⋅K−1.

Part A

Calculate ΔU∘f for K2O.

Part B

Calculate ΔH∘f for K2O.

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