Regents Chemistry Exam June 2024 Question 41

41 What is the amount of heat absorbed to completely melt 26.2 grams of H2O(s) at 0°C?

(1) 8.75 ** 10^3 J (3) 5.92 ** 10^4 J

(2) 3.66 ** 10^4 J (4) 2.48 ** 10^5 J

**Solution: **

*Heat equations can be found in Table T on the Reference Table. The equation for melting is q *= *mHf where q is heat, m is mass and Hf is heat of fusion. Hf of water can be found in Table B on the Reference Table. It is 334J/g. Mass is given in the equation.*

*We get q = 26.2g***334J/g = 8750.8J, choice 1 is the correct answer. *

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