Calculate the emf of the following cell at `25^@C`
`H_2(g) (1atm)//H^+ (aq)|| OH^(-) (aq)//O_2(g) (1atm)` from the following data:
`H_2O=H^+ +OH^(-) , DeltaG^@=76.2kJ//mol e`

Derive expression to calculate emf (reduction) of the following half cells at 25^@C H^+||H_2(Pt) (1 atm)

Write the half reactions for the following redox reaction. Zn(s) + 2H^+ (aq) rarr Zn^(2+) (aq) + H_2(g)

1/2 H_2(g)+AgCl(s)=H^+ (aq)+Cl^(-) (aq)+Ag(s) occurs in the galvanic cell:

Calculate the enthalpy of formation of CH_4 from the following data: C_(s) + O_(2(g)) rarr CO_2(g) DeltaH = -393.5 kJ//mol 2H_(2(g) + O_(2(g)) rarr 2H_2O_(l) DeltaH = -571.8 kJ//mol CH_4(g)+ 2O_(2(g)) rarr CO_2(g) +2H_2O_(l) DeltaH = -890.3 kJ//mol

Calculate the enthalpy of formation of ethăne from the following data: i) 'C(s)+O_2(g) eq CO_2(g) , Delta_r H^circ=-393.5 kJ' ii) 'H_2(g)+1/2 O_2(g) rarr H_2 O(l) , Delta_r H^circ=-285.8 k J' iiii) 'C_2 H_6(g)+7/2 O_2(g) rarr 2 CO_2(g)+3 H_2 O(l) , Delta_r H^circ=1560.0 kJ'