January 2020 NY Regents Chemistry Exam

13 What is the amount of heat released by 1.00 gram of liquid water at 0°C when it changes to 1.00 gram of ice at 0°C?

(1) 4.18 J

(2) 273 J (3) 334 J

(4) 2260 J

Solution: When water changes from liquid to solid phase (ice), 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 1.00 gram 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

q=1.00 g*334 J/g

Answer:3

Prepare for the Chemistry Regents Exam: __HERE__

Contact us for chemistry tutoring: __HERE__

## Comments