(D) The mean molecular weight $M_{avg}$ is given by $\frac{n_1 M_1 + n_2 M_2}{n_1 + n_2}$.Given,$\frac{a \times 32 + b \times 80}{a + b} = 40$.$32a +

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(D) The mean molecular weight $M_{avg}$ is given by $\frac{n_1 M_1 + n_2 M_2}{n_1 + n_2}$.Given,$\frac{a \times 32 + b \times 80}{a + b} = 40$.$32a + 80b = 40a + 40b$.$40b = 8a$,which simplifies to $a = 5b$.Now,for the ratio $b : a$,the mean molecular weight is $\frac{b \times 32 + a \times 80}{b + a}$.Substituting $a = 5b$ into the expression:$= \frac{32b + (5b) \times 80}{b + 5b} = \frac{32b + 400b}{6b}$.$= \frac{432b}{6b} = 72$.

Class 11 Chemistry Some Basic Concepts of Chemistry Mix Examples of Some Basic Concept of Chemistry

Difficult

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

A
$40$
B
$48$
C
$62$
D
$72$

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Class 11 Questions

Class 11

Chemistry Questions

Chapter

Some Basic Concepts of Chemistry

Subtopic

Mix Examples of Some Basic Concept of Chemistry

Match List-$I$ with List-$II$.

List-$I$ List-$II$

$A$. $16 \ g \ CH_{4(g)}$ $I$. Weighs $28 \ g$

$B$. $1 \ g \ H_{2(g)}$ $II$. $60.2 \times 10^{23}$ electrons

$C$. $1 \ mole \ N_{2(g)}$ $III$. Weighs $32 \ g$

$D$. $0.5 \ mol \ SO_{2(g)}$ $IV$. Occupies $11.2 \ L$ volume at $STP$

Choose the correct answer from the options given below:

DifficultJEE MAIN 2023

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The density of an equimolar mixture of $CH_4$ and $CO$ at $STP$ is ............... $g \, L^{-1}$.

Medium

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Iron sulphide is heated in air to form $A$,an oxide of sulphur. $A$ is dissolved in water to give an acid. The basicity of this acid is

MediumTS EAMCET 2002

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Hydrochloric acid solutions $A$ and $B$ have concentrations of $0.5 \ N$ and $0.1 \ N$ respectively. The volumes of solutions $A$ and $B$ required to make $2 \ L$ of $0.2 \ N$ $HCl$ are:

Medium

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$4 \ g$ equimolar mixture of $NaOH$ and $Na_{2}CO_{3}$ contains $x \ g$ of $NaOH$ and $y \ g$ of $Na_{2}CO_{3}$. The value of $x$ is $..... \ g$. (Nearest integer)

DifficultJEE MAIN 2021

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List-$I$	List-$II$
$A$. $16 \ g \ CH_{4(g)}$	$I$. Weighs $28 \ g$
$B$. $1 \ g \ H_{2(g)}$	$II$. $60.2 \times 10^{23}$ electrons
$C$. $1 \ mole \ N_{2(g)}$	$III$. Weighs $32 \ g$
$D$. $0.5 \ mol \ SO_{2(g)}$	$IV$. Occupies $11.2 \ L$ volume at $STP$

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

Similar Questions

The density of an equimolar mixture of $CH_4$ and $CO$ at $STP$ is ............... $g \, L^{-1}$.

Iron sulphide is heated in air to form $A$,an oxide of sulphur. $A$ is dissolved in water to give an acid. The basicity of this acid is

Hydrochloric acid solutions $A$ and $B$ have concentrations of $0.5 \ N$ and $0.1 \ N$ respectively. The volumes of solutions $A$ and $B$ required to make $2 \ L$ of $0.2 \ N$ $HCl$ are:

$4 \ g$ equimolar mixture of $NaOH$ and $Na_{2}CO_{3}$ contains $x \ g$ of $NaOH$ and $y \ g$ of $Na_{2}CO_{3}$. The value of $x$ is $..... \ g$. (Nearest integer)

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