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2 PbO + C -> 2 Pb + CO2
The whole sequence (pq) = pb + 8. b is the midpoint so pb = 1/2pq, making pb = 8 and bq also 8 cm
PP Pp PB Pb PW Pw pP pp pB pb pW pw BP Bp BB Bb BW Bw bP bp bB bb bW bw WP Wp WB Wb WW Ww wP wp wB wb wW ww
NI(NO3)3+pbbr4nibr3+pb(no3)4
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