Question

Lead is a poisonous metal that especially affects children because they retain a larger fraction of lead than adults do. Lead levels of 0.250ppm in a child cause delayed cognitive development. How many moles of lead present in 1.00g of child’s blood would 0.250ppm represent.

Answer 1

$nPb = \frac{mPb}{mmPb} = \frac{ppm(Pb)×msolution}{10^6ppm×mm(Pb)}$

$= \frac{0.250ppm×1.00g}{10^6×207.2g/mol}$

= 1.21mol