1.

(a)How many moles are present in 11.5g of sodium? (b)The mass of an atom of element (X) is 2.0xx10^(-23)g. Calculate its atomic mass.

Answer»

Solution :Gram atomic mass of Na=23g
23g of Na REPRESENT =1 MOL
11.5g of Na represent=`((1"mol")xx(11.5g))/((23.0g))=0.5"mol"`
(B) One atom of element (X) has mass=`2.0xx10^(-23)G`
`=12.044gcong12.0g`


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