Question

How many oxygen is dissolved in 100 mL water at 298 K if partial pressure of oxygen is 0.5 atm and $K_H=1.4\times {10}^{-3}$ mol/L/atm?

• A. 22.4 mg
• B. 22.4 g
• C. 2.24 g
• D. 2.24 mg

Answer 1

The correct option is D 2.24 mg

$K_H\times P=C$

$\Rightarrow 1.4\times {10}^{-3}\times 0.5=\frac{x}{0.1}$

$\Rightarrow 0.7\times {10}^{-4}=x$

$\therefore Mass=(0.7\times {10}^{-4}\times 32)g$

$=(32\times 0.07)mg$

$=2.24mg$