Question

Freshly precipitated yellow suspension of Pbl2 in one test tube and PbCrO, in the other can be confirmed easily by​

Answer 1

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.

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