If the mass of the iron nucleus is $55.85~\text{u}$ and $\mathrm{A} = 56$, the nuclear density of the iron is:

The energy equivalent of $1$ g of substance is:

We are given the following atomic masses:
${ }_{92}^{238} \mathrm{U}=238.05079~\text{u},{ }_2^4 \mathrm{He}=4.00260~\text{u} \\ { }_{90}^{234} \mathrm{Th}=234.04363~\text{u},{ }_1^1 \mathrm{H}=1.00783~\text{u}\\ { }_{91}^{237} \mathrm{~Pa}=237.05121~\text{u}$
Here the symbol $\mathrm{Pa}$ is for the element protactinium $(Z=91)$.
The energy released during the alpha decay of ${}^{238}_{92}\mathrm{U}$ is:
1. $6.14~\text{MeV}$
2. $7.68~\text{MeV}$
3. $4.25~\text{MeV}$
4. $5.01~\text{MeV}$

We are given the following atomic masses:
${ }_{92}^{238} \mathrm{U}=238.05079~\text{u},{ }_2^4 \mathrm{He}=4.00260~\text{u} \\ { }_{90}^{234} \mathrm{Th}=234.04363~\text{u},{ }_1^1 \mathrm{H}=1.00783~\text{u}\\ { }_{91}^{237} \mathrm{~Pa}=237.05121~\text{u}$
Here the symbol Pa is for the element protactinium $(Z=91)$.
Then:

The energy required in $\text{MeV/c}^2$ to separate ${ }_8^{16} \mathrm{O}$ into its constituents is:
(Given: mass defect for ${ }_8^{16} \mathrm{O}=0.13691~ \text{amu}$)

Which one of the following is incorrect?