How many calories are required to rise the temperature

Question

How many calories are requried to rise the temperature of 25 g of water from 50 c to 70 c? The specific heat of water is 1 cal/gc.

Answer 1

The rise in temperature is 20° C.  Since there is no change of phase, and the specific heat is 1, it takes 20*1 = 20 cal per gram to cause this increase.  Since there are 25 g, the answer is 20 * 25 = 500 cal.