1 of water at its boiling point absorbs 540 calories of heat to become steam with a volume of 1671.If the atmospheric pressure = 1.013x and the mechanical equivalent of heat = 4.19 J/calorie, the energy spent in this process in overcoming intermolecular forces is
540 cal
40 cal
500 cal
Zero
As we discussed in concept
work done by a gas -
- wherein
P is pressure
dV is small change in volume.
Energy given to water = 540 cal
= 540 x 4.19 J
= 2262.6 J
Energy required for doing work against atmospheric pressure =
ext
=
= 169 J 40 cal.
Option 1)
540 cal
This option is incorrect.
Option 2)
40 cal
This option is incorrect.
Option 3)
500 cal
This option is correct.
Option 4)
Zero
This option is incorrect.