Question

A sample of water is heated from 35 C to 45 C with 1600 joules. What is the mass of the sample?

A 15-gram sample of water has an initial temperature of 25 C. what is the final temperature of the sample after it loses 125 joules of heat energy?

If 20 grams of water vapor is cooled by removing 45 j of heat, what is its temperature change?

An 18-gram sample of water has a temperature of 16 C after it has absorbed 527 joules of heat energy. What was the initial temperature of the sample?

A 115 gram sample of water has a temp of 60 C after it has absorbed 1923 joules of heat energy. What was the initial temp of the sample?

Answer 1

You can work all of these with one of two or three formulas.
1. q = mass sample x specific heat sample x (Tfinal-Tinitial) if you have the same phase beginning to end. or
2. q = mass sample x heat fusion if the solid sample is being melted.
3. q = mass sample x heat vaporization if the liquid sample is being vaporized (boiled like steam)
For your problem 1 use 1 above.
For your problem 2 use 1 above but be careful. Make sure the answer is realistic.
For your problem 3 use 1
For your problem 4 use 1
For your problem 5 use 1
Post your work if you get stuck.