The production cost of hydrogen from a mineral acid using zinc is Rs. 12 per mole. How many electrons is worth of one rupee? 

Explanation

Reaction of mineral acid with zinc is given as
`Zn+2HClrarrZnCl_(2)+H_(2)`
The net reaction is `2H^(+)+2e^(-)rarrH_(2)`
1 mole of `H_(2) = 2` moles of electrons
12 rupees `= (2 xx 6.022) xx 10^(23)` electrons
1 rupee `= ?`
Number of electrons worth of one rupee
`= (1)/(12)xx 2 xx 6.022 xx 10^(23)=1.004xx10^(23)`