Given the energy obtained by the human body from a candy bar = 915 kJ
Energy required to vaporize 1 g of water at it's boiling point is referred to as heat of vaporization of water.
The heat of vaporization of water = 2260 J/g
Mass of water that can be vaporized by 915 kJ of heat =
Density of water = 1 g/mL
Converting mass to volume in L of 405 g water:
Therefore, 0.405 L of water can be vaporized
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P2 is 3.5 for p4= 2p2 i.e 2*3.5=7