136
Question
A heating coil is immersed in a 100 g sample of H2O(l) at 1 atm and 100∘ C in a closed vessel. In this heating process, 60% of the liquid is converted into a gas at a constant pressure of 1 atm. Densities of liquid and gaseous water under these conditions are 1000 kg/m3 and 0.60 kg/m3 respectively. The magnitude of the work done for this process is: (Take 1 atm =105 Pa)
A heating coil is immersed in a 100 g sample of H2O(l) at 1 atm and 100∘ C in a closed vessel. In this heating process, 60% of the liquid is converted into a gas at a constant pressure of 1 atm. Densities of liquid and gaseous water under these conditions are 1000 kg/m3 and 0.60 kg/m3 respectively. The magnitude of the work done for this process is: (Take 1 atm =105 Pa)
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Solution
The correct option is C 9994 J
w=−PextΔV=−105Pa(60×10−30.6−60×10−31000)
=−105(0.1−6×10−5)
=−9994 J ∴|w|=9994 J
w=−PextΔV=−105Pa(60×10−30.6−60×10−31000)
=−105(0.1−6×10−5)
=−9994 J ∴|w|=9994 J
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