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 zinc is given as
`Zn+2HCl to ZnCl_(2)+H_(2)`
The net reaction is `2H^(+)+2e^(-) to H_(2)`
1 mole of `H_(2)=` 2 moles of electrons
12 ruppees `=(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)=1.004 xx 10^(23)`