Three 1.0 L flasks filled with H2, O2 and He, respectively, are at STP. Which of the following statements concerning these gases is true?
A) Each flask contains the same number of atoms.
B) There are twice as many H2 and O2 molecules as there are He atoms.
C) There are twice as many He atoms as there are H2 or O2 molecules.
D) The number of H2 or O2 molecules is the same as the number of He atoms.
Correct Answer:
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