Question

the weight of copper ( atomic weight-63.5u) displaced Cu2 + ions by the quantity of electricity which displaces 11200 ml of H2 at STP will be​

Answer 1

we have to find the weight of copper (atomic weight = 63.5u ) displaced Cu²⁺ ions by the quantity of electricity which displaces 11200 ml of H2 at STP.

solution : no of moles of H₂ gas at STP = given volume/22400 ml = 11200/22400 = 0.5 mol

as 1 mole of hydrogen gas produces 2 moles of electrons and 2 moles of electrons requires to produce 1 mole of Copper.

so no of moles of Hydrogen = no of moles of copper

⇒0.5 = weight of copper/atomic weight of copper

⇒0.5 = weight of copper/63.5

⇒weight of copper = 63.5 × 0.5 = 31.75 g

Therefore the weight of copper displaced Cu²⁺ ions by the quantity of electricity which displaces 11200 ml of H2 at STP will be 31.75g