How would i write the two redox half-reactions for, Ask an Expert

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How would I write the two redox half-reactions for these:

Ag/Ag⁺| | H⁺/H₂

Cu/Cu²⁺| | H⁺/H₂

H₂/H⁺| | Zn²⁺/Zn

Cu/Cu²⁺| | Zn²⁺/Zn

Ag/Ag⁺| | Zn²⁺/Zn

Would I just write it like this for the first one:

Ag -> ag⁺ + 1e

H⁺+ 1e -> H₂

and then how would I calculate the E_cellfor each one if I am given +0.80 volts on the volt meter for the first one?

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