What amount of heat Q is released during condensation m = 0.1 g of water vapor occurring at a constant temperature?

1. We convert grams to kilograms:

0.1 grams = 0.0001 kilograms.

2. The amount of heat Q is equal to the specific heat of vaporization of water multiplied by the mass m of water. But since during condensation the body loses heat, and does not gain, therefore, we will have r with a minus sign. That is, we have the formula:

Q = -r (water) × m (water).

2. Substitute the values into the formula:

Q = – 2,300,000 J / kg × 0.0001 kg = – 230 J.

Answer: – 230 J.