Yes you need to melt the ice. You may or may not need to convert to mols. Why didn't you type your work and I could find the problem almost instantly. As it is we're well into 2-3 hours for this.
I agree with your 72,360 J for heat to move T from -10 to zero c.
Where (how) did you get 21,672?
"Find the total energy lost by the contents of a Styrofoam picnic cooler when a 3.60 kg block of ice placed inside the cooler completely melts (at 0 Celsius). The ice had an initial temperature of -10.00 Celsius."
My ans are
q1=72360J n q2=21672
q=94032J
But one confussion don't Ive to find the moles for water and then multiply by heat of fusion?
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