States of Matter / पदार्थ की अवस्थाएँ - गैस एवं द्रव
JEE Main & Advanced
Chemistry
States of Matter / पदार्थ की अवस्थाएँ - गैस एवं द्रव
Question Bank
Numerical Value Type Questions - Gaseous State
question_answer
A gaseous mixture of He and \[{{O}_{2}}\] is found to have a density of \[0.518\,\,g{{L}^{-1}}\] at \[25{}^\circ C\] and 720 torr. What is the percent by mass of helium in this mixture?