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)

(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.

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later