Question

How can I calculate "q" thermochemistry?

Answer 1

`q=mcDeltaT`, in which `q` is the energy gained or lost, `m` is mass, `c` is specific heat capacity, and `DeltaT` is the change in temperature (final temperature - initial temperature). The following video from the website http://www.kentchemistry.com/links/Energy/SpecificHeat.htm
is very informative. Note that some people use `Q` instead of `q` and `C` instead of `c`.