Question

$1$g of ice at $0^o$C is added to $5$g water at ${10}^o$C. If the latent heat is $80cal/g$, the final temperature of the mixture is.

• A. $5^o$C
• B. $0^o$C
• C. $-5^o$
• D. None of the above

Answer 1

The correct option is B $0^o$C

Heat required by ice to melt $=1\times 80=80cal$

Heat released by water at ${10}^{o}C=5\times 1\times (10-0)=50cal$

Required heat $>$ Released heat

So, final temperature is $0^{o}C$.