1.

One atom of an element X weighs 6.644 xx 10^(23) g. Calculate the number of gram-atoms in 40 kg of it.

Answer»

SOLUTION :WT. of 1 mole of atoms of X = wt. of 1 atom x Av. const.
`=6.44 xx 10^(-23) xx 6.022 xx 10^(23)`
= 40 g
Thus, the at. Wt. Of X=40
No. Of MOLES (or gram-atoms) of X `=("weight in g")/("at. Wt")`
`=(40 xx 1000)/40 = 1000`


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