How many liters of O, are used to produce 4 moles of CO2?

Answer:
At STP defined as 0° C (273.15 K, 32° F) and 1 atm, the molar volume of a gas is 22.414 L/mol.
Use dimensional analysis to calculate the volume of 4 moles of CO₂.
4 mol CO₂ × 22.414 L/mol = 89.656 L = 90 L (rounded to one significant figure)