A balloon is filled with 3.8 L of helium gas at STP. Approximately how many moles of helium are contained in the balloon?

1 Answer
Apr 16, 2016

Approx. 0.17 mol

Explanation:

The molar volume of an ideal gas at STP is 22.4 L. We have a volume of 3.8L helium gas under these conditions.

Assuming, quite reasonably, that helium behaves ideally, the molar quantity of helium gas is simply the quotient, 3.8L22.4Lmol1 = ?? moles ?