Administering Nitrous Oxide

One of the tanks that a pediatric dentist uses to administer nitrous oxide is “empty”, meaning that the N2O inside is at the same temperature and pressure as the room. The ML-6 type cylinder has an internal volume of 165 liters. How many moles of nitrous oxide remain in the empty tank (Ideal gas constant = 0.082 L atm/K mol; assume the apparatus is at sea level; the ambient temperature is 22° C)?

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Photo attributed to Jurvetson.

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