Question

What is the molar concentration of a lead nitrate solution that is 18.0% (m/m) by mass lead nitrate. Molar Mass[Pb(NO₃)₂] = 331.22 g/mol; Density[Pb(NO₃)₂] = 1.18 g/mL.

Answer 1

Now we will calculate the volume of the solution. To calculate the volume of the solution we have the total mass which is =1+0.18=1.18 grams

So now we will calculate the density of the solution. Lets the density of the solution be called as the average density. It is calculated as follows

Now for that we need the weight fraction of lead nitrate and water. Since we know the weights of lead nitrate and water, thier weight fractions can be calculated as follows.

Now we have both, the density of the solution and also the total mass of the solution. Hence the volume of the solution can be calculated as follows,

The molar concentration can be calculated as follows

Hence the molar concentration is 0.47338 moles/litre

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