Question

A sample of water absorbs 50 KJ of energy when it is heated from 20 C to 60 C. What is the mass of the water?

Answer 1

You need the equation:

\[q=mc \Delta T\]
Where q is the total heat transferred, m is the mass of the object being looked at (water in this case), c is the specific heat of that object (4.18 J/g C - a number you should know), and ∆T is the change in temperature. So, plugging in our values:

\[50000=m(4.18)(60-40) \implies m =299\]
There are 299 g of water.