Question

The Henry's law constant for oxygen is 1.3 × 10^-3 mol dm^-3 atm^-1. If partial pressure of oxygen is 0.46 atmosphere, what is the concentration of dissolved oxygen at 25°C and 1 atm pressure?

Options

• 2.82 × 10^-3 mol dm^-3 

• 5.98 × 10^-4 mol dm^-3 

• 3.53 × 10^-4 mol dm^-3 

• 5.98 mol dm^-3 

Answer 1

5.98 × 10^-4 mol dm^-3 

Explanation:

`"K"_"H" = "S"/"P"`

∴ S = K_H × P

∴ S = 1.3 × 10^-3 mol dm^-3 atm^-1 × 0.46 atm

= 5.98 × 10^-4 mol dm^-3