Question

how many moles of ar are in 7.52 x 10²² ar atoms? 0.125 mol 0.0125 mol 0.0801 mol 0.801 mol 0.315 mol

Explanation:

Step1: Recall Avogadro's number

Avogadro's number \(N_A = 6.022\times 10^{23}\text{ atoms/mol}\). The formula to convert the number of atoms \(N\) to moles \(n\) is \(n=\frac{N}{N_A}\).

Step2: Substitute the values

Given \(N = 7.52\times 10^{22}\text{ atoms}\) and \(N_A=6.022\times 10^{23}\text{ atoms/mol}\). Then \(n=\frac{7.52\times 10^{22}}{6.022\times 10^{23}}\).

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Answer:

A. \(0.125\space mol\)