(D) The molar mass of water $(H_2O)$ is $18 \ g/mol$.The number of moles $(n)$ is calculated as $n = \frac{\text{mass}}{\text{molar mass}} = \frac{180

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$6.023 \times 10^{24}$ molecules of water

(D) The molar mass of water $(H_2O)$ is $18 \ g/mol$.The number of moles $(n)$ is calculated as $n = \frac{\text{mass}}{\text{molar mass}} = \frac{180 \ g}{18 \ g/mol} = 10 \ moles$.The number of molecules is calculated as $n \times N_A = 10 \times 6.023 \times 10^{23} = 6.023 \times 10^{24}$ molecules.Therefore,the correct option is $D$.

Class 11 Chemistry Some Basic Concepts of Chemistry The mole concept

Medium

Which of the following represents $180 \ g$ of water correctly?

A
$5 \ moles$ of water
B
$1 \ mole$ of water
C
$6.023 \times 10^{23}$ molecules of water
D
$6.023 \times 10^{24}$ molecules of water

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Some Basic Concepts of Chemistry

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The mole concept

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Which of the following represents $180 \ g$ of water correctly?

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Number of moles and number of molecules in $1.4187 \ L$ of $SO_2$ at $STP$ respectively are:

Natural abundances of $^{12}C$ and $^{13}C$ isotopes of carbon are $99\,\%$ and $1\,\%$,respectively. Assuming they only contribute to the molecular weight of $C_2F_4$,the percentage of $C_2F_4$ having a molecular mass of $101$ is $.....$

What is the number of molecules in $4.25 \ g$ of $NH_3$?

How many moles of magnesium phosphate,$Mg_{3}(PO_{4})_{2}$ will contain $0.25 \ mol$ of oxygen atoms?

Two flasks $A$ and $B$ of $500 \ mL$ each are filled with $O_2$ and $SO_2$ respectively at $300 \ K$ and $1 \ atm$ pressure. Then the flasks contain:

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