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Ok, so Im confused when given a problem where I have to find the missing final or initial temperature.

Here is an example of one such problem that confuses me:

A 68.2 g sample of copper at 21.2 °C is heated with 75.0 J. The specific heat of copper is 0.385

J/g °C. What is the final temperature of the sample?

I have a big test soon..... and would really like to have a good undersating of these types of problems. ANY help would be great!