$($a$)$ The oxide layer forms only on the upper and lower surfaces, what is the thickness of the oxide layer

formed on the Zircaloy$-2$ component if the weight gain of the specimen is $882m\frac{g}{d}{m}^2$ after the

corrosion test $(5)?$

$($b$)$ If the oxide layer forms only on the upper and lower surfaces, what is the remaining metal thickness

after corrosion $(5)?$

$($c$)$ What is the total number of atoms of hydrogen produced in the corrosion reaction, in atoms $\frac{?}{d{m}^2(5)}?$

$($d$)$ If the hydrogen pick$-$up fraction of the sample was $25\%,$ what is the hydrogen content of the sample

after the corrosion test in wt$.$ ppm$?$ Comment on the value obtained: is it excessive for cladding

ductility? The density and atomic mass of zirconium are $6\mathrm{.}5\frac{g}{c}{m}^3$ and $91\frac{g}{m}ol,$ respectively $(10).$