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Need help determining the correct equation!

  • Chemistry
  • Thread starter katiemager
  • Start date
  • #1

Homework Statement:

How much ice in grams would have to melt to lower the temperature of 52.4 g of water from 50.0 ∘C to 0 ∘C? (Assume that the density of water is 1.0 g/mL.)

Relevant Equations:

q=mc(change in T)
I thought it would be...
q=mc(change in T)
=52.4g(1.0C/gC)(50C)
= 2620 g

This is incorrect. Am I using the right equation?
 

Answers and Replies

  • #2
33,924
9,646
Your value of c is wrong. Fix it and you get the heat in J the ice has to absorb. That is not the amount of ice you need.
 
  • #3
Borek
Mentor
28,328
2,717
Solving problems is NOT about "using a correct equation". It is about understanding the problem and describing it mathematically.

There are two separate thing happening here: one is cooling water - how much heat does it give away?
Second is melting ice - how much ice will the heat given away by water melt?
 

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