A gas mixture is made by combining 7.5 g each of Ar, Ne, and an unknown diatomic gas. At STP, the mixture occupies a volume of 18.53 L.What is the molar mass of the unknown gas?Identify the unknown gas.

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A gas mixture is made by combining 7.5 g each of Ar, Ne, and an unknown diatomic gas. At STP, the mixture occupies a volume of 18.53 L.

What is the molar mass of the unknown gas?

Identify the unknown gas.

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Step 1

Given,

Mass of Ar, Ne and an unknown diatomic gas = 7.5 g

Moles of Ar and Ne can be calculated as:

Step 2

Volume, V = 18.53 L

At STP: Pressure, P = 1 atm and temperature, T = 273 K

The total number of moles in the gas mixture can be calculated using the ideal gas equation as:

Step 3

The molar mass of the unknown g...

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