Which of the following has the greatest mass?
a.1 mole of uranium (u)
b.1 mole of oxygen (o)
c.1 mole of sodium (na)
.1 mole of chlorine (cl)

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(no3)⁻n has oxidation number x,o has oxidation number -2.(x*1 -2*3) charge of the nitrate ion, and we know that charge of the nitrate ion =-1.so,(x*1 -2*3) =-1x-6=-1x=+5answer a. +5.

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