First slide

Gaseous state

Question

1 g Hz and x g O₂ gas exert a total pressure of 5 atm. At a given temperature partial pressure of O₂ gas is 4 atm, O₂ in the mixture is

Moderate

A

I mol
B

2 mol
C

3 mol
D

4 mol

Solution

$p_{H_{2}} + p_{O_{2}} = 5 atm Partial pressure = p_{total} \cdot mole fraction p_{O_{2}} = p_{total} χ_{O_{2}} \Rightarrow 4 = 5 (\frac{\frac{x}{32}}{\frac{x}{32} + \frac{1}{2}}) x = 64 g = 2 mol O_{2}$

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