A mixture of argon and neon has a measured gas density of 1.66 g / L at STP. Assuming ideal‑gas behavior, what is the average molar mass of the mixture?

Answer: The average molar mass of the mixture is 37.184g/mol

Explanation: Density of Argon and Neon at STP = 1.66 g/L

1 mole of a mixture always contains 22.4L at STP.

Therefore, Molar Mass of Argon and Neon =

1.66g/L * 22.4 L/1 mol = 37.184 g/mol

The average molar mass of the mixture is 37.184 g/mole

Explanation:

Density of mixture = 1.66 g/L

1 mole of mixture contains 22.4 L by volume

Molar Mass of mixture = 1.66g/L * 22.4 L/1 mole = 37.184 g/mole