How much heat is needed to raise the temperature of 100 g of water from 25 c to 50 c?

10500 J

Explanation:

Heat: Heat is defined as a form of energy that brings about the sensation of warmth. The S. I unit of heat is Joules (J)

Q = cm (T₂-T₁) ... Equation 1

Where Q = quantity of heat, c = specific heat capacity of water, m = mass of water, T₂ = final temperature, T₁ = initial temperature.

Given: m = 100 g = (100/1000) kg = 0.1 kg, T₁ = 25 °C, T₂ = 50 °C.

Constant: c = 4200 J/kg.°C

Substituting these values into equation 1

Q = 0.1*4200 * (50-25)

Q = 420*25

Q = 10500 J

Thus the amount of heat needed to raise the temperature of 100 g of water from 25 °C to 50 °C = 10500 J