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Freshly precipitated yellow suspension of Pbl2 in one test tube and PbCrO4 in the other can be confirmed easily by |
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Answer» Pb(NO 3 ) 2 +2KI→PbI 2 +2KNO 3 The molar masses of Pb(NO 3 ) 2 and KI are 331.2 g/mol and 166 g/mol respectively. The mass of PbI 2 is 461 g/mol.Let X moles of Pb(NO 3 ) 2 react with 2X moles of KI to PRODUCE X moles of PbI 2 .Total mass of Pb(NO 3 ) 2 and KI that has reacted is 331.2X+2×166×X=663.2X g. The total mass of two was held constant at 5.0 g 633.2X=5 X=0.007539 moles.This is the number of moles of PbI 2 obtained. The mass of PbI 2 obtained =0.007539mol×461g/mol=3.4g.The answer to the nearest integer is 3.Explanation:please mark me as BRILLIANT answer |
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