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A solid mixture(5.0gm)consisting of lead nitrate and sodium nitrate was heated below 600Â°c until the weight of the residue was constant.If the loss in weight is 28%,find the amount of lead nitrate and sodium nitrate in the mixture.

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hyorimaru ·2009-11-01 06:12:00

somebody plz try

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1357

Manish Shankar ·2009-11-01 06:55:15

PbNO₃â†’PbO
let moles of PbNO₃ be x and that of NaNO₃ be y
NaNO₃â†’NaNO₂

initial weight of the mixture=5 g
final weight of the mixture=5*72/100=3.6 g

we have
269x+85y=5
223x+69y=3.6

solve for x and y

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