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A 100W electric heater (1W = 1J/s) operates for 11 min to heat the gas in a cylinder. At the same time, the gas expands from 1L to 6L against a constant external pressure of 3.527 atm. What is the change in internal energy of the gas? (1 L.atm = 0.1013 kJ) a) 48.37 kJ b) 62.47 kJ c) 64.21 kJ d) 67.79 kJ