Question

The molar heat capacity of water at constant pressure is 75 JK⁻¹ mol⁻¹. When 1 kJ of heat is supplied to 100 g of water, which is free to expand, the increase in temperature of the water is ______.

विकल्प

• 6.6 K

• l.2 K

• 2.4 K

• 4.8 K

Answer 1

The molar heat capacity of water at constant pressure is 75 JK⁻¹ mol⁻¹. When 1 kJ of heat is supplied to 100 g of water, which is free to expand, the increase in temperature of the water is 2.4 K.

Explanation:

Given C_p = 75 JK⁻¹ mol⁻¹

n = `100/18` mole, Q = 1000 J, ΔT = ?

Q = nC_pΔT

⇒ ΔT = `(1000 xx 18)/(100 xx 75)`

= 2.4 K