Question

Suppose you have a bucket of sand containing 3.5 billion grains of sand (3.5 × 10^9 grains). Most of the grains of sand are white, but there are some brown grains mixed evenly throughout. 1.If the concentration of brown sand is 8.0 ppm, how many grains of brown sand are in the bucket? 2.If the concentration of brown sand is 8.0 ppb, how many grains of brown sand are in the bucket?

Answer 1

sol Gocen Tolal. sand 3-5 billion. =3.5X16".grains 1 given concentnalion of bro wn sand =8.0ppm sand conc. of brown 1000 000 Therefore briown' sand 3-5X10 _t06 28 X103 228000 grams 2 f concentaalion of brown sand =8.0ppb conc. of brown sand טן' There forie brown sand =8 x8.5X10° qgrarg granm 109 = 28 grams

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