It requires 2,500 joules to raise a certain amount of water (c = 4.186 J/g°C) from 20.0°C to 60.0°C.

What is the mass of the water being heated?

The heat absorbed from the heating of water can be calculated by the product of the mass of the sample, specific heat and the difference in temperature. From the given data, we can simply calculate the mass of the sample as follows:

H = mC (T2-T1)

2500 = m (4.186) (60-20)

m = 14.93 g