For an ideal gas, which expression relates density ρ to molar mass M, pressure P, temperature T, and the gas constant R?

For an ideal gas, which expression relates density ρ to molar mass M, pressure P, temperature T, and the gas constant R?

• A. ρ = P R T / M
• B. ρ = P /(R T M)
• C. ρ = P M /(R T)
• D. ρ = R P /(M T)

Answer: (C)