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*(334J)/(g)`

q = 8350 J

since, 1000 = 1 kJ

So,
`8350J((1kJ)/(1000J))`

= 8.35 kJ

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