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Question

Some quantity of electricity was passed through two cells, one containing HCl and the other AgNO3 solution. What volume of H2 will be liberated at NTP, if 1.08 × 104 kg of Ag got deposited at the other electrode?
(Molar mass of Ag=108 g mol1, H=1 g mol1)

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Solution

2e+AgNO3+HClAg+H2+NO3+Cl
By stoichiometry, moles of Ag= Moles of H2 liberated.
Moles of Ag=1.08×104×103108 moles=103 moles.
Moles of H2 liberated =103 moles.
At NTP, 1 mole of H2=22.414dm3
103 mole of H2=22.414×103dm3=22.414m3

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