Answer:
Fraction of water that can be vaporized = 0.0961 or 9.61%
<em>Note : The question is incomplete. The complete question is given below:</em>
<em>A serving of Cheez-Its releases 130 kcal (1 kcal = 4.18 kJ) when digested by your body.</em>
<em>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?</em>
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%
