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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