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InterviewSolution
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Which of the following has the minimum number of atoms?A. `0.5g` atom of `Cu`B. `0.635g` of `Cu`C. `0.25` mol of `Cu`D. `6.35xx10^(20) u` of `Cu` |
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Answer» Correct Answer - D It has the minimum number of moles, and hence, the number of atoms. One gram atoms means 1 mol of atoms, thus `0.5` gram atoms `Cu` means `0.5` mol `Cu`. `0.635g Cu` contains `(0.635g//63.5g mol^(-1)) = 0.01 mol Cu` `(63.5xx10^(20)u)/(63.5 u//"atom") rarr 10^(9)` atoms `rarr 10^(19)//6.022xx10^(23) rarr 1.661xx10^(-5) mol` |
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