Homework Help: I need help figuring out the kg of ice can you melt

1. Mar 28, 2012

cwalker8184

1. The problem statement, all variables and given/known data

The exact question is "how many kg of ice can you melt, assuming it is at the melting point, with 178,000 cal of heat"

2. Relevant equations

3. The attempt at a solution
I can't give any other imformation. I have know idea where to even, start with solving this problem. I really need help! Big test tomorrow...

2. Mar 28, 2012

rock.freak667

Well how much Joules is 178,000 calories? What formula will show you the energy required to melt 'm' kilograms of ice? (Hint: what equation do you use for heat required to change the phase of a substance? Not sensible heat but?)

3. Mar 28, 2012

cwalker8184

The equation for heat I believe is Q = mcΔT or Q=cpmΔT
I am still totally lost. I have no ideas how many joules are in 178,000 calories all this looks pretty foreign to me. I need help breaking this down, to have any chance of passing this test tomorrow.

4. Mar 28, 2012

rock.freak667

Right, that's the equation if I want to find how much heat I need to raise the temperature of something. That's called sensible heat.

Have you ever heard of latent heat?