Question

Given equal conditions, which gas below is expected to have the greatest density?

• A. $H_2$
• B. $Ne$
• C. $Ar$
• D. $H_{2}S$
• E. ${Cl}_2$

Answer 1

The correct option is E ${Cl}_2$

As Molar volume of all gas is same at STP, hence, at STP all these gas have same volume for 1 mol of these gases.
Now, more the molar mass more will be density, hence, $C{l}_2$ gas must have highest density than the other as other have lesser molar mass than $C{l}_2$.
Molar mass of $C{l}_2$ = 71 g .