Question

At 273 K, the density of a certain gaseous oxide at 2 atmosphere is same as that of dioxygen at 5 atmosphere. The molecular mass of the oxide (in g mol\textsuperscript{--1}) is

• A. 80
• B. 64
• C. 32
• D. 160
• E. 70

Hint:

If density and temperature are constant, the molar mass is inversely proportional to pressure ($M \propto 1/P$). Higher pressure requires a smaller molar mass to maintain the same density!

Answer 1

The Correct Option is A