Lead(Pb)is an element in group 4 of the Periodic Table.
(a)An oxide of lead,X,contains 90.6% of lead by mass.Calculate the empirical
formula of X.
(b)X is known to be a mixed oxide composed of PbO and PbO2.Based
on your answer in (a) ,deduce the mole ratio of PbO to PbO2 in X
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