How Is the Specific Latent Heat of Fusion for Ice Calculated?

[swede5670]

Homework Statement

Determine the specific latent heat of fusion of ice given the amount of time it takes the ice to melt (150 seconds). Energy is supplied to the ice at 530 W. The sample is .25 kg.

Homework Equations

Q= ml

The Attempt at a Solution

(Time * 530W) = .25kg * L
150 seconds * 530W = .25kg * L
(150 * 530)/.25 = 318,000
This seems huge, can anyone help me determine what the units are?

 

[LowlyPion]

Homework Statement

Determine the specific latent heat of fusion of ice given the amount of time it takes the ice to melt (150 seconds). Energy is supplied to the ice at 530 W. The sample is .25 kg.

Homework Equations

Q= ml

The Attempt at a Solution

(Time * 530W) = .25kg * L
150 seconds * 530W = .25kg * L
(150 * 530)/.25 = 318,000
This seems huge, can anyone help me determine what the units are?

What are the units of the quantities you calculated with?

Watts = Joules/sec

So watts * sec = Joules

You used mass as kg, so what you calculated is ...

Latency = Joules/kg