The vapour density of a mixture of gas $A$ (molecular mass = $40$) and gas $B$ (molecular mass = $80$) is $25$. Then, mole percentage of gas $B$ in the mixture would be :

Q. The vapour density of a mixture of gas A (molecular mass = 40 ) and gas B (molecular mass = 80) is 25. Then, mole percentage of gas B in the mixture would be:

Q. Vapour density of a gas $A$ is three times that of gas $B$. If the molecular mass of $B$ is $X$, the molecular mass of $A$ is:

Q. A mixture of $O_2$ and gas $Y$ (mol. wt. $80$) in the mole ratio $a:b$ has a mean molecular weight $40$. What would be mean molecular weight, if the gases are mixed in the ratio $b:a$ under identical conditions? (Gases are non-reacting)

Q. The vapour density of gas A is four times that of B. If the molecular mass of B is $M$, then the molecular mass of A will be:

Q. A mixture of $O_2$ and gas "Y" (mol.wt.80) in the mole ratio $a:b$ has a mean molecular weight 40. What would be mean molecular weight, if the gases are mixed in the ratio $b:a$ under identical conditions? (gases are non-reacting):