$E=\left(Z{m}_p+\left(A-Z\right)m_n-m_{\text{Cn}}\right)c^2$

$E=\left(112\cdot 1,67262192\cdot 10^{-27}\mathrm{kg}+\left(277-112\right)\cdot 1,67492749\cdot 10^{-27}\mathrm{kg}-460,139952\cdot 10^{-27}\mathrm{kg}\right)\cdot$

${\left(2,99792458\cdot 10^8\frac{\mathrm{m}}{\mathrm{s}}\right)}^2\approx \left(187,333655\cdot 10^{-27}\mathrm{kg}+276,362955\cdot 10^{-27}\mathrm{kg}-460,139952\cdot 10^{-27}\mathrm{kg}\right)\cdot$

$8,987552\cdot 10^{16}\frac{{\mathrm{m}}^2}{{\mathrm{s}}^2}\approx 3,556658\cdot 10^{-27}\mathrm{kg}\cdot 8,987552\cdot 10^{16}\frac{{\mathrm{m}}^2}{{\mathrm{s}}^2}\approx 31,965649\cdot 10^{-11}\mathrm{kg}\cdot \frac{{\mathrm{m}}^2}{{\mathrm{s}}^2}\approx$

$\approx 3,196565\cdot 10^{-10}\mathrm{J}\approx 3,20\cdot 10^{-10}\mathrm{J}$