The mass of 10^{21} atoms of Cu is ..... gram | vedclass

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(B) The molar mass of $Cu$ is $63.5 \ g/mol$.The number of atoms in $1 \ mole$ is $N_A = 6.022 	imes 10^{23} \ atoms/mol$.Mass of $10^{21}$ atoms of

Vedclass · Accepted Answer

$0.106$

Vedclass · Answer

(B) The molar mass of $Cu$ is $63.5 \ g/mol$.The number of atoms in $1 \ mole$ is $N_A = 6.022 	imes 10^{23} \ atoms/mol$.Mass of $10^{21}$ atoms of $Cu = \frac{	ext{Molar mass}}{N_A} 	imes 	ext{Number of atoms}$.Mass $= \frac{63.5}{6.022 	imes 10^{23}} 	imes 10^{21} \ g$.Mass $\approx \frac{63.5}{6} 	imes 10^{-2} \ g$.Mass $\approx 10.583 	imes 10^{-2} \ g = 0.1058 \ g \approx 0.106 \ g$.

The mass of $10^{21}$ atoms of $Cu$ is ..... grams.

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