Question

sin 2a)

Answer 1

Calculate 0.14 ppm of 101 grams

1 ppm Pb is $\large 10^{-6}$ grams of lead in 1 gram of blood

1 ppm Pb is

10-6 g Pb/g blood 1 ppm Pb

0.14 ppm Pb will be

0.14 ppm Pb x 10-69 Pb/g blood 1 ppm Pb

It gives amount of Pb present in 1 gram of blood. There are 101 grams of blood.

= 1.41 10-6 g Pb/g blood 101 g blood x (0.14 ppm Pb x = 1 ppm Pb 110-5 Pb

Hence, grams of lead are needed to accumulate in 101 grams of blood to affect human intellegence.

1.4 x 10-5