1.

Which has more number of atoms, 100 grams of sodium or 100 grams of iron ? (Given : atomic mass of Na = 23 u, Fe = 56 u.)

Answer»

Solution :23 g of Na (i.e., 1 MOLE) = `6.022 xx 10^(23)` atoms
`:.` 100G of Na = `(100 xx 6.022 xx 10^(23))/(23) = 26.18 xx 10^(23) = 2.618 xx 10^(24)` atoms .......(1)
56g of Fe (i.e., 1 mole) = `6.022 xx 10^(23)` atoms
`:.` 100 g of Fe =`(100 xx 6.022 xx 10^(23))/(56) = 10.75 xx 10^(23) = 1.075 xx 10^(24)` atoms .......(2)
From (1) and (2), 100 g of Na has more atoms than 100 g of Fe.


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