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The mercury content of a stream was beli...

The mercury content of a stream was believed to be above the minimum considered safe limit (1 part per billion, by mass). An analysis indicated that the concentration was 1.68 parts per billion. How many Hg atoms are present in 15 L of water, the density of which is 0.998 g/ml. (Hg = 200)

A

`7.57 xx 10^(13)`

B

`7.57 xx 10^(19)`

C

`7.57 xx 10^(16)`

D

`5.37 xx 10^(16)`

Text Solution

Verified by Experts

The correct Answer is:
C
1.68 ppb of Hg
Grams of water `= 15 xx 0.998 xx 10^(3)`
Grams of Hg in this sample `= (gw)/(10^(9)) xx 1.68`
Atoms of `Hg = (gw)/(10^(9)) xx (1.68)/(200) xx N_(A) = 7.57 xx 10^(16)`
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