I can tell this worksheet is going to be a nightmare because im stuck on number one....

**What mass of ice was converted from -20.00*C to liquid water at 78.00*C by 7560 calories?**i have gotten this far..

(.5 cal/g)(M)(0*C - 20.00*C) + (80 cal/g)(M) + (1 cal/g)(M)(78.00-0)= 7560 calories

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v v v

10g(M) + 80g(M) + 78.00g(M) = 7560 calories

is this correct up to this point?

i have no clue what to do next, i know it involves algebra though