A 1865 g sample of ground water is found to contain 0.0862 g of arsenic. Calculate the concentration of arsenic in parts per million, ppm.

Answer 1

0.0862/1865 = 4.621983914 x 10^-5

to get ppm multiply by one million = 10^6

4.621983914 x 10^-5 x 10^6

= 46.21983914 ppm

= about 46 ppm