(B) The molar mass of $N_2 = 28 \ g/mol$ and $O_2 = 32 \ g/mol$. Number of moles of $N_2 (n_{N_2}) = \frac{7}{28} = 0.25 \ mol$. Number of moles of $O

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(B) The molar mass of $N_2 = 28 \ g/mol$ and $O_2 = 32 \ g/mol$. Number of moles of $N_2 (n_{N_2}) = \frac{7}{28} = 0.25 \ mol$. Number of moles of $O_2 (n_{O_2}) = \frac{8}{32} = 0.25 \ mol$. Mole fraction of $O_2 (x_{O_2}) = \frac{n_{O_2}}{n_{N_2} + n_{O_2}} = \frac{0.25}{0.25 + 0.25} = \frac{0.25}{0.50} = 0.5$.

Class 11 Chemistry Some Basic Concepts of Chemistry The mole concept

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What is the mole fraction of oxygen in a mixture of $7 \ g$ of nitrogen and $8 \ g$ of oxygen?

A
$8/15$
B
$0.5$
C
$0.25$
D
$1.0$

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Some Basic Concepts of Chemistry

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The mole concept

Numbers of gram atoms of oxygen present in $0.8 \ mol$ of $C_4H_6O_6$ would be

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The system that contains the maximum number of atoms is

DifficultWBJEE 2014

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How many molecules are present in one gram of hydrogen? (Value $\times 10^{23}$)

MediumAIIMS 1982

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How many moles of oxygen atoms are present in $64.4 \ g$ of $Na_2SO_4 \cdot 10H_2O$?

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Assertion : The number of $O$ atoms in $16 \ g$ of oxygen and $16 \ g$ of ozone is same.
Reason : Each of the species represents $1 \ g$ molecule of oxygen.

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What is the mole fraction of oxygen in a mixture of $7 \ g$ of nitrogen and $8 \ g$ of oxygen?

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Numbers of gram atoms of oxygen present in $0.8 \ mol$ of $C_4H_6O_6$ would be

The system that contains the maximum number of atoms is

How many molecules are present in one gram of hydrogen? (Value $\times 10^{23}$)

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Assertion : The number of $O$ atoms in $16 \ g$ of oxygen and $16 \ g$ of ozone is same.Reason : Each of the species represents $1 \ g$ molecule of oxygen.

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Assertion : The number of $O$ atoms in $16 \ g$ of oxygen and $16 \ g$ of ozone is same.
Reason : Each of the species represents $1 \ g$ molecule of oxygen.