Calculate the number of particles in each of the following:
(i) 46 g of Na atoms (number from mass)
(ii) `8 g O_(2)` molecules (number of molecules from mass)
(iii) 0.1 mole of carbon atoms (number from given moles)

Explanation

No. of particle (atoms)`=("Given mass (m)")/("Molar mass (M)")xx"Avogadro's no. "(N_(0))`
`=((46g))/((23g))xx(6.022xx10^(23))=1.025xx10^(24)"atoms"`
(ii) 6g of oxygen `(O_(2))`
No. of particles (molecules)
`=("Given mass (m)")/("Molar mass (M)")xx"Avogadro's no. "(N_(0))`
`=((8g))/((32g))xx(6.022xx10^(23))=1.51xx10^(23)"molecules"`
(iii) 0.1 mole of carbon atoms
No. of particles (atoms)=`"No. of moles (n)"xx"Avogadro's no."N_(0)`
`=(0.1)xx(6.022xx10^(23))=6.022xx10^(22)"atoms"`