Question

The composition (in mole percent) of the atmosphere is 78.1% N2, 21.0% O2, and 0.9% Ar. What is the partial pressure of each gas when the barometric pressure is 754.1 mm Hg?

Answer 1

Answer:

N2 = 588.95 mm Hg

O2 = 158.36 mm Hg

Ar = 6.787 mm Hg

Explanation:

Their percentage represents their mole fraction.

N2= 78.1% = 0.781

O2 = 21.0% = 0.21

Ar = 0.9% = 0.009

Barometric pressure is 754.1 mm Hg

Partial pressure for each will be,

For N2 = 0.781 x 754.1 = 588.95 mm Hg

For O2 = 0.21 x 754.1 = 158.36 mm Hg

For Ar = 0.009 x 754.1 = 6.787 mm Hg

Answer 2

The partial pressure of each gas should be

N2 = 588.95 mm Hg

O2 = 158.36 mm Hg

Ar = 6.787 mm Hg

Calculation of the partial pressure:

Since The composition (in mole percent) of the atmosphere is 78.1% N2, 21.0% O2, and 0.9% Ar.

Their percentage shows their mole fraction.

That means

N2= 78.1% = 0.781

O2 = 21.0% = 0.21

Ar = 0.9% = 0.009

Since Barometric pressure is 754.1 mm Hg

So, Partial pressure for each will be,

For N2 = 0.781 x 754.1 = 588.95 mm Hg

For O2 = 0.21 x 754.1 = 158.36 mm Hg

For Ar = 0.009 x 754.1 = 6.787 mm Hg

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