Problem: Suppose you are given two 1-L flasks and told that one contains a gas of molar mass 30, the other a gas of molar mass 60, both at the same temperature. The pressure in flask A is X atm, and the mass of gas in the flask is 1.2 g . The pressure in flask B is 0.5X atm, and the mass of gas in that flask is 1.2 g .Which flask contains gas of molar mass 30, and which contains the gas of molar mass 60?

FREE Expert Solution
  • We can establish a relationship between moles of the gases to their P and V using the ideal gas equation
  • Since T and R are constant, we can say that

PV = n 

  • Flask A will appear as PV = n:

n = X*n

  • Flask B will appear as:

n = 0.5X*n

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Problem Details

Suppose you are given two 1-L flasks and told that one contains a gas of molar mass 30, the other a gas of molar mass 60, both at the same temperature. The pressure in flask A is X atm, and the mass of gas in the flask is 1.2 g . The pressure in flask B is 0.5X atm, and the mass of gas in that flask is 1.2 g .

Which flask contains gas of molar mass 30, and which contains the gas of molar mass 60?

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What scientific concept do you need to know in order to solve this problem?

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.