a) sum of heat gained by the product and heat lost from the evaporator to its surroundings
b) sum of heat lost from the evaporator to its surroundings in each step
c) heat gained by the product
d) overall heat lost from the evaporator
Answer: a
Explanation: According to law of conservation of energy, the heat lost by heating water must be equal to the sum of heat gained by the product and heat lost from the evaporator to its surroundings.
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