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Which sample at STP has the same number of atoms as 18 liters of Ne(g) at STP?(1) 18 moles of Ar(g)

August 2018 NY Regents Chemistry Exam


18 Which sample at STP has the same number of atoms as 18 liters of Ne(g) at STP? (1) 18 moles of Ar(g) (2) 18 liters of Ar(g) (3) 18 grams of H2O(g) (4) 18 milliliters of H2O(g)


Solution:Gases with the same pressure, temperature and volume have the same number of molecules. The question has 18 liters of Ne in the given. We are looking for an answer choice with the same volume, 18 liters.

Answer: 2


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