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`        A certain public water supplies contains 0.1ppb of chloroform. How many molecules of chloroform would be obtained in 0.478ml drop of this water ( assume density of water =1g/ml)`
6 months ago

## Answers : (1)

Arun
23330 Points
```							Supposing you live some place where "billion" means 10^9: (1 drop H2O) × (1/20 mL/drop) × (1.0 g H2O/mL) × (0.10 × 10^-9) / (119.3776 g CHCl3/mol) ×  (6.022 × 10^23 molecules/mol CHCl3) = 2.5 × 10^10 molecules CHCl3
```
6 months ago
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