Question

What is the specific gravity of CO2 at 27^oC and pressure 1 atm with respect to air of with density 1 g/L?

(a) 1.23

(b) 1.55

(c) 1.78

(d) 1.96

I had been asked this question during an interview for a job.

My question is from Ideal Gas Law in chapter Recycle, Bypass, Purge, Ideal Gases and Real Gases of Basic Chemical Engineering

Answer 1

Right choice is (c) 1.78

The explanation: Density of CO2 = PM/RT = 1*44/(0.0821*300) = 1.78 g/L, => Specific gravity = 1.78/1 = 1.78.