Calorimetry problem

[mrdorky]

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Calculate the amount of heat needed to bring 10 g of ice from -15C to 110C.
Heat of fusion = 80 cal/g; heat of vaporization = 540 cal/g. The heat capacities of both ice and steam vary with temperature. for this problem use the estimate of 0.5 cal/g*K for both.

I am just not getting this problem... 😕

 

[vindicate]

5 parts to the problem


1. energy required to go from -15 ice to 0 ice
2. energy required to melt
3. energy required to go from 0 water to 100 water
4. energy required to boil
5. energy required to go from 100 steam to 110


the formula you use for 1, 3, and 5 = heat capacity*grams*change in T
and for 2 and 4 = heat of fusion or heat of vaporization * grams

answer should be sum of 1-5.

 

[mrdorky]

ok i was confused about the heat of fusion/vaporization equation bc when I was watching chad's vids,
he used the equation (n * Heat of fustion/vaporization)
n = mole of water

 

[vindicate]

ok i was confused about the heat of fusion/vaporization equation bc when I was watching chad's vids,
he used the equation (n * Heat of fustion/vaporization)
n = mole of water

it's in terms of whatever the problem gives it to you in.

they even will give you problems with heat of fusion/vaporization in moles
and heat capacity in grams

just gotta recognize the units given in the problem to see which (grams or moles) to use.

 

[mrdorky]

oh ok. Thanks a bunch! I really appreciate the help =)