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Chemistry Regents June 2005 - Question 70 |
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Written by The Chemistry Wizard
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Correct Answer: 915 joules
The heat of fusion is the thermal energy required for 1 mole of substance to change state from a solid to a liquid. This energy is the extra energy that is required when melting is occurring and is responsible for the temperature remaining constant during this period.
Answering the question:
To answer this question you do not require any knowledge of chemistry but instead basic mathematics. Since heat of fusion is 122 joules per gram and you are melting 7.5 grams then the answer would be 7.5g x 122j/g = 915 joules.
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