Use dimensional analysis.


Now you try converting moles to grams. All you have to do is start with MOLES (Unlike the previous examples) over 1 then multiply that ratio by the ratio of molar mass over 1 mole. Hope this helps!
3.815 that's the awnser......................................
Answer: Thus 663 J of heat is released when 27.6 g
cools from 83.1 °C to 55.6 °C
Explanation:
The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.

Q = Heat released = ?
m = mass of substance = 27.6 g
C = specific heat capacity = 
Initial temperature=
= 
Final temperature =
= 
Change in temperature ,
Putting in the values, we get:

As the value of q is negative, it means the heat has been released and it is 663J
Number of significant digits is 3.