Question

Does anyone know how to do this pleaseeeee

Answer 1

See the answer below.

Step-by-step explanation:

The latent heat of fusion is defined as the amount of energy needed to make a phase change from solid to liquid. And it can be calculated by means of the following expression:

`Q_(fusion)=m*Dh`

where:

Qfusion = Heat Energy [J]

m = mass = 0.65 [kg]

Dh = latent heat fusion = 330000[J/kg]

`Q_(fusion)=0.65*330000\\Q_(fusion)=214500[J]`

2)

We know that energy can be calculated from power, where power is defined as the relationship between energy over time.

`P=E/t`

where:

P = power = 60 [w]

E = energy [J]

t = time = 5 [min] = 300 [s]

`E=P*t\\E=50*300\\E=15000[J]`

The mass change due to the process is equal to:

`m=282-274\\m=8[g]=0.008[kg]`

Now using the following equation for the latent heat of Fusion, we can calculate this value:

`Q=m*Dh\\Dh =Q/m\\Dh=15000/0.008\\Dh=1875000[J/kg]`