how many moles of electron are present in a single drop of water of volume 1ml with density = 1gm/ml

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Solution

Dear Student,

$G i v e n, D e n s i t y o f w a t e r = 1 g / m l . S o, w e i g h t o f 1 m l w a t e r = 1 g . W e i g h t o f 1 m o l o f H_{2} O = 18 g S o, 1 g w a t e r m e a n s \frac{1}{18} m o l o f H_{2} O N o w, 1 m o l e o f H_{2} O h a s 18 m o l e s o f e l e c t r o n (b e c a u s e 1 m o l e c u l e h a s 18 e l e c t r o n s) S o, 1 g w a t e r h a s (\frac{1}{18} m o l o f H_{2} O \times 18 m o l e l e c t r o n s p e r H_{2} O) = 1 m o l e o f e l e c t r o n s .$

Regards
Arnab Bhattacharya

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