Final answer:
The relative humidity of air can be calculated by dividing the current water vapor density by the saturation vapor density and then multiplying by 100 to get a percentage. In this case, the relative humidity is approximately 59.1%, corresponding to option (a).
Step-by-step explanation:
The question seems to be about calculating the relative humidity of air given the amount of water vapor in the air at a specific temperature. The relative humidity is calculated by dividing the amount of water vapor present in the air by the maximum amount of water vapor the air can hold at that temperature and then multiplying by 100 to get a percentage.
To calculate the relative humidity given that air at 25°C contains 15.2g/cm³ of water vapor and can hold a maximum of 25.7g/cm³ of water vapor at the same temperature, you can use the following formula:
Relative Humidity (%) = (Vapor Density / Saturation Vapor Density) × 100 = (15.2 / 25.7) × 100
When you do the calculation:
Relative Humidity (%) = (15.2 / 25.7) × 100 = 0.5912 × 100 = 59.12%
Therefore, the relative humidity is approximately 59.1%, which corresponds to option (a).