Question

Which gas sample at STP has the same number of molecules as a 2.0-liter sample of Cl2(g) at STP?
(1) 1.0 L of NH3(g) (3) 3.0 L of CO2(g)
(2) 2.0 L of CH4(g) (4) 4.0 L of NO(g)

Answer 1

(2) 2.0 L of CH4(g) is your answer.
According to Avogadro's law, all gases have equal volume if there are equal number of particles under the same conditions. Therefore, we can use the corollary to state that all gases have equal number of particles if they have the same volume, and the only choice with 2.0 L was #2, therefore #2 was your answer.

Answer 2

The gas sample at STP has the same number of molecules as a 2.0-liter sample of Cl2(g) at STP is 2.0 L of CH4(g).

What is Avogadro's law?

Avogadro’s law states that the gases with equal number pf molecules have the same volume.

The number of molecules of gases, Cl2(g) at STP is 2.0-liter. According to the Avogadro's law, the gases that have the same volume is CH4 because it has the same number of molecules.

Thus, the correct option is (2) 2.0 L of CH4(g).

Learn more about Avogadro's law

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