The Nernst equation that gives us the emf for the cell

${\mathrm{Pt}}_{\left(\mathrm{S}\right)},{\mathrm{H}}_{2(\mathrm{g},4\mathrm{Bar})},{\mathrm{H}}_{(\mathrm{aq},1\mathrm{M})}^{+},{\mathrm{H}}_{2(\mathrm{g},2\mathrm{Bar})},{\mathrm{Pt}}_{\left(\mathrm{S}\right)}$

${\mathrm{E}}_{\mathrm{cell}}=0.0-\frac{2.303\mathrm{RT}}{\mathrm{F}}{\log }_{10}\frac{\left[2\mathrm{atm}\right]}{\left[4\mathrm{atm}\right]}$

${\mathrm{E}}_{\mathrm{cell}}=0.0-\frac{2\mathrm{F}}{2.303\mathrm{RT}}{\log }_{10}\frac{\left[4\mathrm{atm}\right]}{\left[2\mathrm{atm}\right]}$

${\mathrm{E}}_{\mathrm{cell}}=0.0-\frac{2.303\mathrm{RT}}{2\mathrm{F}}{\log }_{10}\frac{\left[4\mathrm{atm}\right]}{\left[2\mathrm{atm}\right]}$

${\mathrm{E}}_{\mathrm{cell}}=0.0-\frac{2.303\mathrm{RT}}{2\mathrm{F}}{\log }_{10}\frac{\left[2\mathrm{atm}\right]}{\left[4\mathrm{atm}\right]}$