Question

How much heat energy is gained when 5 kg of water at ${20}^{\circ }C$ is brought to its boiling point?

• A. 1680 KJ
• B. 1700 KJ
• C. 1720 KJ
• D. 1740 KJ

Answer 1

Answer: (A)

The correct option is A 1680 KJ
$Q=mc\Delta \theta$

$=5\times \left(1000\times 4.2\right)\times \left(100-20\right)$

$=1680\times {10}^{3}J$

$=1680KJ$

Hence,

option $\left(A\right)$ is correct answer.