One mole of carbon atom weighs 12 ; g. The nu | vedclass

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(A) The number of atoms in one mole of a substance is defined by Avogadro's number $(N_A)$.Given that the mass of one mole of carbon is $12 \; g$ and

Vedclass · Accepted Answer

$6.022 	imes 10^{23}$

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(A) The number of atoms in one mole of a substance is defined by Avogadro's number $(N_A)$.Given that the mass of one mole of carbon is $12 \; g$ and the mass of a single carbon-$12$ atom is $1.9926 	imes 10^{-23} \; g$.The number of atoms $= \frac{	ext{Total mass}}{	ext{Mass of one atom}} = \frac{12 \; g}{1.9926 	imes 10^{-23} \; g} \approx 6.022 	imes 10^{23}$ atoms.Thus,the number of atoms in one mole of carbon is $6.022 	imes 10^{23}$.

List-$I$ (Mass of substance)	List-$II$ (Number of atoms)
$A$. $1.8 \text{ mg}$ water	$I$. $2 \times 10^{-4} \times N_{A}$
$B$. $9.8 \text{ mg}$ sulphuric acid	$II$. $1.5 \times 10^{-4} \times N_{A}$
$C$. $1.8 \text{ mg}$ carbon	$III$. $3 \times 10^{-4} \times N_{A}$
$D$. $5.85 \text{ mg}$ salt (NaCl)	$IV$. $7 \times 10^{-4} \times N_{A}$

One mole of carbon atom weighs $12 \; g$. The number of atoms in it is equal to: (Mass of one carbon-$12$ atom is $1.9926 \times 10^{-23} \; g$)

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