Assuming the experimental mass of \( ^{12}_{6}\mathrm{C} \) as \( 12\,u \), the mass defect of \( ^{12}_{6}\mathrm{C} \) atom is ____________ \( \text{MeV}/c^2 \).
(Mass of proton \( = 1.00727\,u \). mass of neutron \( = 1.0866\,u \), \( 1\,u = 931.5\, \text{MeV}/c^2 \) and \( c \) is the speed of the light in vacuum).
