Chemistry - Chemical Kinetics Question with Solution | TestHub

${\mathrm{}}_{\mathrm{Z}}^{\mathrm{M}}\mathrm{A}\left(\mathrm{g}\right){\to }_{\mathrm{Z}-4}^{\mathrm{M}-8}\mathrm{B}\left(\mathrm{g}\right)+$($\mathrm{\alpha }$-particles)
($\mathrm{\alpha }$- particles are helium nuclei, so will form helium gas by trapping electron(s)). The radioactive disintegration follows first order kinetics starting with 1 mol of A in a 1-litre closed flask at$27°\mathrm{C}$pressure developed after two half lives is approximately