Question

When 20 calories of heat is added to 2.0 grams of water at 15 c, the temperature of the water increases to?

Answer 1

20 calories equals to 8.368 joules.
4.184 J is needed to raise 1 gram of water.(Heat capacity of water)
for 2 grams of water 8.368 joules.

So the answer is 16 c.