## molar mass of gas X... pls help

the mass of a 250cm3 round bottomed flask is filled with gas X is determined to be 16.2850g. the mass of the empty flask and stopper is 15.9516g. what is the molar mass of gas X?

am i right to do it this way:

mass of gas X alone = 16.2850 - 15.9516 = 0.3334g
volume of gas X = 250/1000 = 0.25 dm3

molar mass of gas X = 0.3334/0.25 = 1.3336g/dm3

however, the answer is 32g, where did i make a mistake?

thank you
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 what conditions are you working under?? STP? molar mass= g/mol not g/L If its at room temp then you have: 295K 1 atm 24.2 L/mol .250L/(24.2L/mol)= .01033mol .3334g/.01033mol= 34g/mol
 working under rtp thank you

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