Question

How much heat is necessary to heat 200 g of water at 10°C to 85°C?

Answer 1

Given

Mass of water, m= 200g

Change in temperature,

$T=85^oC-10^oC=75^oC$

To find

Heat required

Explanation

We know specific heat of water is

$c=\frac{4.18J}{g^oC}$

Thus heat required is

$\begin{gathered} Q=mcT \\ \Rightarrow Q=200\times4.18\times75 \\ \Rightarrow Q=62700J \end{gathered}$

Conclusion

The heat necessary is 62700 J