x A storage tank made of an FCC iron structure is to be manufactured that will allow no more 100 x 104 H atoms/m2 to pass through it in one minute at 950. The composition of the hydrogen is 1 x 1026 H atoms/m3 on the other side. Calculate (a) concentration gradient and (b) the minimum thickness of the required. It is possible to fabricate such storage tank? Data: D for Hin FCC Fe at 950C = 9.09 x 10-9 m2/s