# How is the used to calculate the energy needed to melt a mass of solid?

## How is the used to calculate the energy needed to melt a mass of solid?

The amount of heat energy required to change the state of 1 kg of a substance at its melting point is called the specific latent heat of the substance. The specific latent heat of water is: l f = 3 ⋅ 34 × 10 5 J k g − 1 for fusion (solid→liquid) or freezing (liquid→solid)

How do you calculate the energy needed to melt?

Key Takeaways: Heat of Fusion for Melting Ice

1. Heat of fusion is the amount of energy in the form of heat needed to change the state of matter from a solid to a liquid (melting.)
2. The formula to calculate heat of fusion is: q = m·ΔHf

How do you calculate delta H fusion?

The Formula for the Heat of Fusion:

1. We compute it as: \Delta H_f = \frac{q}{m} \Delta H_f. heat of fusion. q. Heat. m. mass.
2. q = m \times \Delta H_f,\\ = 26 \times 334 \\
3. \Delta H_f = \frac{q}{m} = \frac{668}{2}
4. Here, H_f =1500 J. Q = 334 C per gram. \Delta H_f = \frac{q}{m}
5. m = \frac {H_f}{q} = \frac {1500}{ 334 }

### How do you calculate the latent heat of fusion of ice?

Find the latent heat of fusion, Lf, according to Lf = q ÷ m by dividing the heat, q, absorbed by the ice, as determined in step 3, by the mass of ice, m, determined in step 4. In this case, Lf = q / m = 2293 J ÷ 7.0 g = 328 J/g.

What is energy formula?

The energy stored in an object due to its position and height is known as potential energy and is given by the formula: P.E. = mgh. Unit. The SI unit of energy is Joules (J).

How do you calculate the mass of ice melting?

Determine the mass of the ice cubes by subtracting the mass of the cup and water from the mass of the cup, water and ice cubes together. If the cup, water and ice together weighed 110.4 g, then the mass of the ice cubes was 110.4 g – 103.4 g = 7.0 g.

#### Why is melting called fusion?

This phenomenon is called fusion because when two separate solid objects made from the same substance are melted, they can get mixed together into a…

How do you calculate heat of solidification?

The quantity of heat absorbed by a melting solid is exactly the same as the quantity of heat released when the liquid solidifies; that is, ΔHfus = –ΔHsolid. The quantity of heat absorbed by a vaporizing liquid is exactly the same as the quantity of heat released when the vapor condenses; that is, ΔHvap = –ΔHcond.

How do you calculate the amount of energy needed to melt ice?

Using the equation for a change in temperature and the value for water from Table 1, we find that Q = mLf = (1.0 kg)(334 kJ/kg) = 334 kJ is the energy to melt a kilogram of ice. This is a lot of energy as it represents the same amount of energy needed to raise the temperature of 1 kg of liquid water from 0ºC to 79.8ºC.