How many liters of carbon monoxide at STP are in 3.85 x 10^24 molecules of carbon monoxide?
1 mol carbon monoxide= 6.022 × 10^23 molecules of carbon monoxide
At STP, 1 mol of an ideal gas = 22.4 liters
(3.85 x 10^24 molecules)(1 mol/6.022 × 10^23 molecules)(22.4 liters/1 mol)
notice the units cancel out to liters.