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Solution: Assuming the heat released from the combustion of CH 4 can b...

Question

Assuming the heat released from the combustion of CH 4 can be used with 100% efficiency, how much CH4 (in g) is required to be combusted in the presence of excess oxygen to warm 1.75 kg of water (Cw= 4.184 J/gK) from 25.0 to 98.0 °C? The enthalpy of combustion of CH4 is -802.3 kJ/mol.

A. 56.5 g

B. 46.2 g

C. 28.7 g

D. 10.7 g

E. 7.04 g