Answer: It can contain 20% water vapor .
Step-by-step explanation:
Given formula : [tex]\text{Relative Humidity}=\dfrac{\text{Specific humidity}}{\text{maximum capacity}}\times100[/tex]
Given : The maximum amount of water vapor air can contain at a particular temperature= 50 g/kg.
Specific humidity =10 g/kg
Then, [tex]\text{Relative Humidity}=\dfrac{10}{50}\times100= 20\%[/tex]
i.e. Relative humidity = 20% .
Hence, it can contain 20% water vapor .