Chemistry

Question Analysis
This question involves converting the mass of two noble gases to moles, calculating total moles of a binary mixture, and applying the mole fraction form of Dalton’s Law of Partial Pressures. The main focus is on accurate mole calculation for monatomic gases and partial pressure derivation.

Key Concept Explanation
For mass-based binary gas mixtures, the core steps are consistent:
1. Convert mass to moles using the formula , where = mass of the gas and = molar mass of the gas (noble gases are monatomic, so molar mass equals atomic mass).
2. Calculate total moles of the mixture: .
3. Find the partial pressure of the target gas via .
This method is valid only for non-reacting ideal gas mixtures.

Step-by-Step Solution
1. Calculate moles of each gas:


2. Find total moles of the mixture: