I don't understand the question. Is the first statement and the second a continuation? That is, is the S containing compound the same as the 140 g of the gas?
Use PV = nRT to calculate n.
Then use n = grams/molar mass and calculate molar mass.
Use 29% S and 71% F to determine the empirical formula and use the molar mass to confirm. Post your work if you get stuck.
A gas containing sulfur and fluorine analyzed as 29 % sulfur. A 140 g sample of a gas occupied a volume of 50.1 L with a pressure of 478.80 torr at 296.00 K. Enter the molecular formula of the compound.
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