Jan 2019 NY Regents Chemistry Exam

41 Which numerical setup can be used to calculate the heat energy required to completely melt 100. grams of H2O(s) at 0°C? (1) (100. g)(334 J/g) (2) (100. g)(2260 J/g) (3) (100. g)(4.18 J/g•K)(0°C)

(4) (100. g)(4.18 J/g•K)(273 K)

Solution:When water changes from solid phase (ice) to liquid, we use Heat of fusion in our calculations. All of the heat equations can be found on Table T in the Reference Table. An equation that involves heat of fusion is **q = mHf **where *q*=heat and *Hf *=heat of fusion. Mass is 100. grams according to the question. Heat of fusion of water can be found in Table B and is 334 J/g. Now, we can plug everything in

Answer:1

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