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At the sea level, the dry air mass percentage composition is given as nitrogen gas: 70.0, oxygen gas: 27.0 and argon gas: 3.0. If total pressure is 1.15 atm, then calculate the ratio of following respectively: (i) partial pressure of nitrogen gas to partial pressure of oxygen gas (ii) partial pressure of oxygen gas to partial pressure of argon gas (Given: Molar mass of N, O and Ar are 14, 16 and 40 g mol−1 respectively.)

1. 2.59, 11.85
2. 5.46, 17.8
3. 2.96, 11.2
4. 4.26, 19.3

Correct answer: 2.96, 11.2

Solution

The correct option is derived from calculating the partial pressures of nitrogen, oxygen, and argon using their respective percentage compositions and the total pressure. The ratios of these partial pressures yield the values 2.96 for nitrogen to oxygen and 11.2 for oxygen to argon, confirming the accuracy of the calculations.

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