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What is the molar mass of the gas?

Chemistry..Please Help!! Effusion..What is the molar mass of the unknown gas?

  • A sample of an unknown gas effuses in 12.1 min. An equal volume of H2 in the same apparatus at the same temperature and pressure effuses in 2.31 min. What is the molar mass of the unknown gas? ______________ g/mol

  • Answer:

    Here is how I was told how to do it. Rate for H2/ Rate for X = √MM of X / √ MM of H2 12.3/2.92 = √MMof X/ √ 2.016 4.21* 1.42 = √ MM of X 5.97 =√MMof X MMof X = 597² MM of X = 35.73 g/mol plug in 12.1 for 12.3 and 2.31 for 2.92 and you will get your answer

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