Question

How much heat will be required to raise the temperature of 5kg of water from 20˚Cto100˚C?

Answer 1

Given:

Mass of water (m) = 5 kg

Initial temperature (T₁) = 20°C

Final temperature (T₂) = 100°C

Specific heat capacity of water (c) = 1 kcal/kg°C

To Find:

Heat required (Q)

Formula:

The formula to calculate the heat energy required is:

Q = m · c · ΔT

(where ΔT is the change in temperature: T₂ − T₁)

Calculation:

1. Find the change in temperature (ΔT):

ΔT = 100°C − 20°C

= 80°C

2. Substitute the values into the formula:

Q = 5 · 1 · 80

Q = 400