16.8 litre gas containing `H_(2)` and `O_(2)` is formed at NTP on electrolysis of water . What should be the weight of electrolysed water

Options

A. 5 g
B. 9 g
C. 10 g
D. 12 g

Answer

B

Explanation

`n = (16.8)/(22.4) = 0.75` mole of `H_(2) and O_(2)`

2 mole `H_(2)` and = 2 mole `H_(2)O`
`0.5` mole `H_(2)` = 0.5 mole `H_(2)O = 9g`