Answer:
Fraction of water that can be vaporized = 0.0961 or 9.61%
Note : The question is incomplete. The complete question is given below:
A serving of Cheez-Its releases 130 kcal (1 kcal = 4.18 kJ) when digested by your body.
If this same quantity of energy were transferred to 2.5 kg of water at its boiling point, what fraction of the water would be vaporized?
Explanation:
Energy released by a serving of Cheeze-Its = 130 kcal
Since 1 kcal = 4.18 kJ, 130 kcal = 130 * 4.18 kJ = 543.4 kJ
Heat of vaporization (evaporating or condensing) Hv, of water = 2260 J/g
From formula, quantity of heat, Q = mass * heat of vaporization
mass of water = 2.5 kg = 2500 g
Q = 2500 g * 2260 J/g
Q = 5650000 J = 5650 kJ
Therefore 2.5 kg of water requires 5650 kJ of heat for complete vaporization
Fraction of water that can be vaporized by 543.4 kJ energy = 543.4/5650
Fraction of water that can be vaporized = 0.0961 or 9.61%
