Question

What is the final temperature of the mixture of 300 g of water at ${25}^{o}C$ added to 100 of ice at $0^{o}C$.

• A. $0^{o}C$
• B. $1^{o}C$
• C. $2^{o}C$
• D. $3^{o}C$

Answer 1

The correct option is A $0^{o}C$

Heat lost by a hot body $=$ Heat gained by a

$\therefore 300(25-\theta )=100\times 80+100\times 0.5\theta$

$\therefore \theta =-\frac{5}{3.5}$

Since $\theta$ is negative

Heat lost is utilised to melt only same part of ice. Hence equilibrium temperature is $0^{o}C$.