A 50.0-g sample of liquid water at 25.0 °C is mixed with 23.0 g of water at 79.0 °C.The final temperature of the water is ________ °C.
A)123
B)27.3
C)52.0
D)231
E)42.0

Question

Quizplus · Accepted Answer

The final temperature can be found using the principle of conservation of energy, where the heat lost by the hot water equals the heat gained by the cold water. Since both substances are water, their specific heat capacities are the same, and thus, the calculation simplifies. The final temperature is a weighted average of the initial temperatures, taking into account the masses of the two water samples.

A 500-G Sample of Liquid Water at 25