One mole of which gas has the greatest density at STP? A)Ar B)N₂ C)CO D)All three gases have the same density.

Question

Quizplus · Accepted Answer

The density of a gas at STP is directly proportional to its molar mass. Among the given options, argon (Ar) has the highest molar mass (39.95 g/mol) and therefore the highest density at STP. Nitrogen oxide (N₂) is not a valid chemical formula. Carbon monoxide (CO) has a lower molar mass (28.01 g/mol) compared to Ar, hence a lower density at STP.

One Mole of Which Gas Has the Greatest Density at STP