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Chemistry 19 Online
Glupo:

What is the mass (in grams) of 5.00 L of propane vapor (C₃H₈) at STP

Mercury:

at STP 1 mol of any gas = 22.4L so you can divide 5.00/22.4 to get moles, and from there multiply by the molar mass to get mass in grams

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