Method of Mixtures

Q. $300g$ of coconut oil at ${50}^{\circ }C$ is mixed with $500g$ kerosene at ${10}^{\circ }C$. Determine the temperature of the mixture. (Specific heat of coconut oil = $2100Jk{g}^{-1}{K}^{-1}$ and specific heat of kerosene = $2000Jk{g}^{-1}{K}^{-1}$.

1. ${19.89}^{\circ }C$
2. ${35.78}^{\circ }C$
3. ${25.46}^{\circ }C$
4. ${45.43}^{\circ }C$

Q.

What happens to the specific heat capacity of water, if the quantity of water increases?

1. It decreases.

2. Insufficient data.

3. It increases.

4. Remains the same.

Q. Two samples, each containing $400g$ of water, are mixed. The temperature of sample A before mixing was ${20}^{\circ }C$ and that of sample B was ${65}^{\circ }C$. What will be the final temperature of the mixture? (Specific heat of water = 4186 J/kg K)

1. ${22.5}^{\circ }C$
2. ${32.5}^{\circ }C$
3. ${42.5}^{\circ }C$
4. ${52.5}^{\circ }C$