For the Daniell cell $Zn (s) ∣Z n^{2 +} (aq) ∣∣C u^{2 +} (aq) ∣Cu (s)$ , given $E_{Z n^{2 +} /Zn}^{\circ} = - 0.76 V$ and $E_{C u^{2 +} /Cu}^{\circ} = + 0.34 V$ , what is the standard cell potential $E_{cell}^{\circ}$ ?

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