Question

Use the formula given above to calculate the heat gained (Q) for 1 kg of IRON (Ciron= 462 J/kgoC) as it increases in temperature from 0oC to 100oC.

Answer 1

Given:

1 kg of IRON (C_(iron)= 462 J/kg°C) increases in temperature from 0°C to 100°C.

To find:

Heat gained by the metal ?

Calculation:

As per CALORIMETRY, the heat gained is given by the expression:

$\therefore \: H = m \times c \times \Delta \theta$

$\implies\: H = m_{iron} \times c_{iron}\times \Delta \theta$

$\implies\: H = 1 \times 462\times (100 - 0)$

$\implies\: H = 1 \times 462\times 100$

$\implies\: H = 462\times 100 \: joule$

$\implies\: H = 46.2\times 1000 \: joule$

$\implies\: H = 46.2\: kilojoule$

So, heat gained by metal is 46.2 kJ