Question

How much heat energy in Joules is necessary to raise the temperature of $5kg$ of water from ${20}^o$ to ${100}^o$?

• A. $1672KJ$
• B. $167200J$
• C. $16720J$
• D. $1672J$

Answer 1

The correct option is A $1672KJ$

Given,

$m=5kg=5,000g$

$\Delta T={100}^{0}C-{20}^{0}C={80}^{0}C$

The magnitude of heat energy in joule is $H$

$H=4.186\times 5000\times 80=1672400J$

$H=1672\times {10}^3=1672KJ$

The correct option is A.