Question

How many kilojoules are required at 0 C to melt an ice cube with a mass of 25 g

Answer 1

Answer:- 8.35 kJ

Solution:- It asks to calculate the heat required to melt 25 g of ice at 0 degree C. It is a phase change and the heat energy is calculated by using the formula:

$q=m\Delta H_f_u_s$

where q is the heat energy, m is the mass and $\Delta H_f_u_s$ is the enthalpy of fusion of ice. Enthalpy of fusion of ice is 334 Joule per gram.

Let's plug in the given values in the formula:

$q=25g*\frac{334J}{g}$

q = 8350 J

since, 1000 = 1 kJ

So, $8350J(\frac{1kJ}{1000J})$

= 8.35 kJ

So, 8.35 kJ of heat is required to melt 25 g of ice at 0 degree C.