A solid mixture weighing $5.0 ext{ g}$ consists of lead nitrate, $ ext{Pb(NO}_3 ext{)}_2$, and so

Question

A solid mixture weighing $5.0	ext{ g}$ consists of lead nitrate, $	ext{Pb(NO}_3	ext{)}_2$, and sodium nitrate, $	ext{NaNO}_3$. It is heated below $600^\circ	ext{C}$ until the weight of the residue becomes constant. The total loss in weight of the mixture is $28.0\%$. (Given molar masses: $	ext{Pb(NO}_3	ext{)}_2 = 331$, $	ext{NaNO}_3 = 85$, $	ext{NO}_2 = 46$, $	ext{O}_2 = 32$)

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