1.

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

Answer»

Solution :The number of `"ATOMS" // "molecules"= ("GIVEN MASS")/("molar mass") xx "Avogadro number"`
i.e., `N= (m)/(M) xx N_(A)`
(i) `N= (46)/(23) xx 6.022 xx 10^(23)` [Molar mass of NA = 23 g]
`= 2 xx 6.022 xx 10^(23) ~~ 12.044 xx 10^(23)`
(ii) `N=(8)/(32) xx 6.022 xx 10^(23)` [Molar mass of `O_(2)` = 32 g]
`=(1)/(4) xx 6.022 xx 10^(23) ~~ 1.51 xx 10^(23)`
(iii) The number of atoms = `"number of moles" xx "Avogadro number"`
`:.` the number of carbon atoms = `0.1 xx 6.022 xx 10^(23) = 6.022 xx 10^(22)`


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