Question

what is the volume, in liters, of 2.8 moles of NO2 gas at STP?

Answer 1

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1 mole of gas at STP has a volume of 22.4 Liter.
The only thing you have to do is multiply the amount of moles (2.8) by 22.4 :)

Answer 2

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Answer 3

LOL @abb0t Does it look like i am?

Answer 4

or you could use the equation PV=nRT you have all the variabbles needed to solve for Volume.