August 2018 NY Regents Chemistry Exam

41 What is the amount of heat, in joules, required to increase the temperature of a 49.5-gram sample of water from 22°C to 66°C?

Solution: All of the heat equations can be found on Table T in the Reference Table. An equation that involves change in temperature is q=mCΔT where q=heat m = mass and C = specific heat capacity. m=49.5 g from the question

ΔT = Tfinal - Tinitial = 66°C-22°C= 44°C (please note the difference in temperature is the same for K and °C)

C = 4.18 J/g•K (can be found in Table B on the Reference Table)

Now, we can plug everything into the equation and solve.

Answer:3

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