mole to mole/mass to mass

Question

20 moles of Pb(NO302 will produce blank moles of PbCrO4.

 

If you start with 5.5 grams of lead nitrate, how many grams of potassium nitrate will be produced.

Answer 1

You need a chemical reaction, which you did not state.  Let us assume it is

Pb(NO3)2 + K2CrO4 ==> 2NO3 + PbCrO4  balanced equation

 

Assuming K2CrO4 is present in excess, then...

20 moles Pb(NO3)2 will produce 20 moles of PbCrO4 because in the balanced equation the mole ratios are 1:1

 

5.5 grams Pb(NO3)2 x 1 mole/331 g = 0.0166 moles Pb(NO3)2

0.0166 moles Pb(NO3)2 x 2 moles KNO3/1 mole Pb(NO3)2 = 0.0332 moles KNO3 produced (2:1 mole ratio in balanced equation)

 

0.0332 moles KNO3 x 101 g/mole = 3.4 grams KNO3 produced (2 significant figures)