If the number of electrons present in 1990mg of perchlorate ion is a×1023 then the value of ‘a′ would be? Give your answer upto two decimal only. (Given NA=6.02×1023, molar mass of Cl=35.5g)
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Solution
Molar mass ofClO−4=35.5+16×4g=99.5g Number of moles =1990×10−399.5=20×10−3 number of electrons in oneClO−4=17+32+1=50 Therefore, number of moles of electron =20×10−3×50=1 Hence, number of electrons =1×6.02×1023=6.02×1023 Hence, a=6.02