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You use Dimensional Analysis to solve this problem (it’s all on the paper). But the answer is 5.27 x 10 moles of CuCO3
The atomic mass number of the unknown nucleus is 128.
The relationship between the radius of the nucleus r and the atomic mass A is given by
If we assume that the nucleus is a sphere, the volume V is
let the volume of the nucleus having atomic mass number of 64 be V, then the volume of the unknown nucleus having atomic mass number A is written as
Thus, we find that the atomic mass number of the unknown nucleus is A=128
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