Question

how many moles of cu are present in 1.51 x 10²² atoms cu? 9.09 moles cu 0.0251 moles cu 9.09 x 10⁴⁵ moles cu 2.51 x 10⁴⁴ moles cu

Explanation:

Step1: Recall Avogadro's number

Avogadro's number \(N_A = 6.022\times10^{23}\text{ atoms/mol}\). The formula to convert the number of atoms \(N\) to moles \(n\) is \(n=\frac{N}{N_A}\).

Step2: Substitute the values

Given \(N = 1.51\times 10^{22}\text{ atoms}\) and \(N_A=6.022\times 10^{23}\text{ atoms/mol}\). Then \(n=\frac{1.51\times 10^{22}}{6.022\times 10^{23}}\).

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Answer:

\(0.0251\) moles \(\text{Cu}\) (the second option).