Question

with the following equation Pb(SO4)2 + 4 LiNO3 = Pb(NO3)4 + 2Li2SO4 How many moles of lead (IV) nitrate are produced by 68 grams of lithium nitrate?

Answer 1

The first step to answer this question is to convert the given mass (68g LiNO3) to moles using the molar mass of lithium nitrate:

$68gLiNO_3\cdot\frac{1molLiNO_3}{68.946gLiNO_3}=0.98molLiNO_3$

According to the given equation, 4 moles of LiNO3 produce 1 mole of Pb(NO3)4, the next step is to use this ratio to determine how many moles of Pb(NO3)4 are produced:

$0.98molLiNO_3\cdot\frac{1molPb(NO_3)_4}{4molLiNO_3}=0.245molPb(NO_3)_4$

It means that 0.245 moles of lead (IV) nitrate are produced.