A battery charger used to recharge the NiMH (nickel metal-hydride) batteries used in a digital camera...

A battery charger used to recharge the NiMH (nickel metal-hydride) batteries used in a digital camera can deliver as much as 0.35 A of current to each battery. If it takes 145 minutes to recharge one battery, how much Ni(OH)2 (in grams) is oxidized to NiO(OH)?

H2O(l) + e? + NiO(OH)(s) ? OH?(aq) + Ni(OH)2(s)

Expert Solution

The mass of metal deposited is

Where

W = mass of meatl deposited = ?

E = Equivalent mass of Nickel = At.mass / valence

= 58.7 / 2

= 29.35

C = current = 0.35 A

t = time taken = 145 min

= 145 min x 60 (s/min)

= 8700 s

Plug the values we get

So mass of nickel deposited is 0.93 g

So this amount of nickel is deposited by the oxidation if Ni(OH)₂

Therefore the mass of Ni(OH)₂ oxidized is = 0.93 g

queen_honey_blossom answered 4 hours ago

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