L of a gas at STP?

[deleted74029]

I feel like I should know this but I'm having a mind block today.

One of my kaplan answer explanations says, "At STP, .3mol of F2 = 6.7 liters.

How do you find this?

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[not respect]

from PV = nRT,

1 mol of an ideal gas at STP = 22.4 L