Question

Suppose you have a bucket of sand containing 4.5 billion grains of sand (4.5 x 10° grains). Most of the grains of sand are white, but there are some brown grains mixed evenly throughout. If the concentration of brown sand is 4.0%, how many grains of brown sand are in the bucket? brown grains If the concentration of brown sand is 4.0 ppm, how many grains of brown sand are in the bucket? brown grains If the concentration of brown sand is 4.0 ppb, how many grains of brown sand are in the bucket? brown grains Explain your reasoning: This ungraded area will provide insight to your

Answer 1

Solution : Total Number of grains of sand = 4.5 x 100 grains (ire whitet Brown) Now, # If the concentration of brown and is 4.0% :- So, % Concentration of brown sand= No. of brown sand Total No. of grains of sand X 100 4.0 1 No. of grains of brown Sand 4.58 109 X 100 > No. of grains of brown and = 4 x 4.5 x 10 9 100 = 18 x 107 Hence, No. of grains of brown Sand in bucket = 188 107 grains the concentration of brown Sand is 4.0 ppm # Ppm of brown Sand = No. of grains of brown sand Total No. of grains of Sand X 106 =) 4. No. of grains of brown Sand 4.58 109 X lob CS can scanner

No. of grains of brown Sand= 4 x 4.5 x 109 106 X 18x 103 grains Hence, No. of grains of brown and = 18x103 18x 103 grains chor # If the Concentration of brown Sand ig 4.0 Pbb So, Pbb of brown sand = No. of grains of bootan sand Total No. of grains of Sand X 109 n 4.0 = No. of grains of brown Sand 4.5 x 109 X 109 = No. of grains of brown sand 4.0 x 4.5 x Log = 18 le9 Hence, No. of grains of browen Sand = 18 grains CS ante Scanner