How Do You Calculate the Molar Mass of an Unknown Gas?

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To calculate the molar mass of the unknown gas, apply the ideal gas law (PV=nRT) for both the known hydrogen gas and the unknown gas. Given 0.712 g of H2, determine its number of moles and use the same conditions for the unknown gas, which has a mass of 13 g. The molar mass can be found by comparing the ratios of the masses and moles of the two gases. It is not necessary to assume standard temperature and pressure (STP) as the result remains consistent under ideal gas behavior. The key is to set up and solve the ideal gas equations correctly.
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HELP PLEASE! Molar mass of unknown gas

Hey, I would really appreciate a little help. I'm kind of confused :( with this question:

A sample bulb contained 0.712 g of H2 (g) at a certain temperature and pressure. Under the same conditions of temperature an pressure, the bulb can hold 13 g of an unknown gas. What is the molar mass of the unknown mass?? Does anybody know if I have to apply the ideal gal law and how??

Thank you!
 
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Yeah. Write down the Ideal gas law in both the cases. Do you see how to solve it now?
 
given the only data in the problem, do i have to assume STP in both?

Thanks!
 
No, the result is independent of the temperature, pressure and volume, if we assume ideal gas behaviour.
Just write the ideal gas equations and solve.
 

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