Final answer:
The density of CO₂ at STP is approximately 1.965 g/L, calculated by dividing the molar mass of CO₂, which is 44.01 g/mol, by the molar volume of an ideal gas at STP, which is 22.4 L/mol.
Step-by-step explanation:
The density of CO₂ gas at standard temperature and pressure (STP), which is 0°C (273 K) and 1 atmosphere (atm), can be calculated using the molar mass of CO₂ and the molar volume of an ideal gas at STP. The molar mass of CO₂ is 44.01 grams per mole (g/mol), and the molar volume of an ideal gas at STP is 22.4 liters per mole (L/mol).
Using these values, the density of CO₂ at STP can be calculated as follows:
Density = Molar Mass / Molar Volume = 44.01 g/mol / 22.4 L/mol = 1.965 g/L
This value is an approximation under the assumption that CO₂ behaves as an ideal gas under these conditions. In reality, the density might vary slightly due to non-ideal gas behavior.