What mass of water can be heated from 20 ° C to boiling by transferring 672 kJ of heat

What mass of water can be heated from 20 ° C to boiling by transferring 672 kJ of heat to the liquid? Specific heat capacity of water 4200 J / kg × ° С

The amount of heat imparted to the body when heated is determined by the formula:

Q = C * m * (T2 – T1), C – specific heat, m – mass, T2 and T1 final and initial temperatures.

Let us express the mass from the above formula:

m = Q / C * (T2 – T1).

Substitute the given values (T2 = 100 C):

m = 672 / 4.2 (100 – 20) = 672/336 = 2 kg.

Answer: the required mass of water is 2 kg.