The heat of fusion for a substance is 122 joules per gram. How many joules of heat are need to melt 7.50 grams of this substance at its melting point?
1 answer
Question:
The heat of fusion for a substance is 122 joules per gram. How many joules of heat are need to melt 7.50 grams of this substance at its melting point?
Answers
Answer:915 JoulesExplanation:The heat of fusion is the heat that is required to convert a given mass of a substance from solid state to liquid state without change in temperature.In this case, we are given specific heat of a substance as 122 joules per gramIt means that amount of heat equivalent to 122 joules is required to change 1 gram of the substance from solid state to liquid state.Therefore, we can determine the amount of heat needed to change 7.5 grams of the substance from solid to liquid state.1 g = 122 Joules 7.5 g = ? = 122 × 7.5 = 915 Joules Thus, 7.5 g of the substance at its melting point will require 915 Joules of heat to melt.
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