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Question
Calculate the number of moles in 1.51 × 1023 molecules of NH4Cl.
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Solution
1.51 × 1023 molecules of NH4Cl
A number of moles = `"Number of molecules"/"Avogadro’s number" = (1.51×10^23)/(6.023×10^23)` = 0.25 moles.
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