Question

The molar heat capacity of water at constant pressure P is $75J{K}^{-1}mo{l}^{-1}$. When 1.0 kJ of heat is supplied to 100 g of water which is free to expand, the increase in temperature of water is:

• A. 1.2 K
• B. 2.4 K
• C. 4.8 K
• D. 6.6 K

Answer 1

The correct option is B

2.4 K

$q=nC\Delta T$

We need to convert the given mass of water to the number of moles of water as molar heat capacity of water is given to us.

$1000=\frac{100}{18}\times 75\times \Delta T$

$\Delta T=2.4K$