Question

A sample of toothpaste weighing 500 g, on analysis was found to contain 0.2g of fluorine. The concentra uon
of fluorine in ppm is
(1) 4 x 103
(3) 4 x 10
(2) 4 x 10²
(4) 2 x 10²​

Answer 1

Answer:

4 * 10^2

Explanation:

500 g toothpaste contain 0.2 g fluorine

1 g toothpaste contains 0.2/500 g fluorine

1 million ( 10^6 ) g toothpaste will contain = 0.2/500 * 10^6

                                                                     = 400

                                                                     = 4* 10^2  g fluorine