What is the amount of heat liberated (in kJ) from 327 g of mercury when it cools from 77.8°C to 12.0°C?
For this problem we have to use the specific heat capacity equation:
Based on what you've given me, we have the mass of the sample (m), the specific heat (c), and the change in temperature
Since you want the amount of heat liberated to have units of kJ, you need to convert
We can do that by using this relationship:
1000J = 1kJ
Divide 0.139 by 1000 to obtain
Now, all of the variables have good units, so we just have to multiply all of the given values together to obtain Q (energy transferred).