Practice: Consider two containers of gases at the same temperature. One has helium at a pressure of 1.00 atm. The other contains carbon dioxide with the same density as the helium gas. What is the pressure of the carbon dioxide gas sample?
Under certain conditions of pressure and temperature, the Ideal Gas Law can determine the density of a gas.
The Ideal Gas Law (Density)
Concept #1: Density
Example #1: An unknown gas sample has a density of 1.70 g/L. If the sample has a volume 120.0 mL, what is its mass in grams?
Concept #2: Ideal Gas Law Density (EASY)
Concept #3: Ideal Gas Law Density (HARD)
Example #2: A gaseous compound of nitrogen and hydrogen is found to have a density of 0.977 g/L at 0.69474 atm and 373.15 K. What is the molecular formula of the compound?
Practice: Determine the molecular formula of a gaseous compound that is 49.48% carbon, 5.19% hydrogen, 28.85% nitrogen, and 16.48% oxygen. At 27°C, the density of the gas is 1.5535 g/L and it exerts a pressure of 0.092 atm.