Problem: A gas mixture is made by combining 8.3 g of Ar, Ne, and an unknown diatomic gas. At STP, the mixture volume of 20.50 L. Identify the unknown gas. What is the molar mass of the unknown gas? 

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A gas mixture is made by combining 8.3 g of Ar, Ne, and an unknown diatomic gas. At STP, the mixture volume of 20.50 L. 

Identify the unknown gas. 

What is the molar mass of the unknown gas? 

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Our tutors have indicated that to solve this problem you will need to apply the Ideal Gas Law Molar Mass concept. If you need more Ideal Gas Law Molar Mass practice, you can also practice Ideal Gas Law Molar Mass practice problems.