Answer:
10500 J
Step-by-step 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