Calculate the number of moles in 1.51 * 10^23 molecules of NH4Cl
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so your answer is
![5 \times {10}^{22?} 5 \times {10}^{22?}](https://tex.z-dn.net/?f=5+%5Ctimes++%7B10%7D%5E%7B22%3F%7D+)
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