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 followings res

Question

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 followings 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 respectively)

Canvas Classes · Accepted Answer

Strategy:
 Convert mass percentages into mole fractions. According to Dalton's Law, the ratio of partial pressures is equivalent to the ratio of moles (or mole fractions) of the gases.

Step 1: Assume 100 g basis
- Nitrogen: .
- Oxygen: .
- Argon: .

Step 2: Calculate Ratios
(i) .
(ii) .

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