For parts A) what are the air partial pressure and for B) partial pressure
For parts A) what are the air partial pressure and for B) partial pressure
(a)
Before cloud formation, the air's partial pressure (Pa) and water vapor density (mg/m3) can be determined using the provided table.
According to the table, at a temperature of -50 °C, the saturated water vapor pressure is 4 Pa. This indicates that the maximum amount of water vapor the air can hold at this temperature is equivalent to a pressure of 4 Pa.
The water vapor density (mg/m3) can be calculated using the following formula:
Density = (Partial pressure Molecular weight) / (Gas constant Temperature)
where:
Partial pressure = 4 Pa Molecular weight of water (H2O) = 18.015 g/mol = 0.018015 g/mgGas constant = 8.314 J/(mol·K)Temperature = -50°C=223.15°K
Plugging these values into the formula:
Density = (4 Pa 0.018015 g/mg) / (8.314 J/(mol·K) 223.15 K)
Density = 0.0000405m 
Explanation
Therefore, prior to cloud formation, the air's partial pressure is 4 Pa and the water vapor density is approximately 0.0000405 mg/m3.
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