Which of the following pairs share the same empirical formula?

ch4 and c2h4

pbcl2 and pbcl4< my answer, correct?

no2 and n2o4

c2h6 and ch4

Iwould appreciate if someone could me.

Which of the following is not an assumption that scientists must make about the natural world? a. regularity b. causality c. predictability d. plausibility

How can you write e method for the experiment of separating sand from water by filtration process? 1-materials 2-steps 3-conclusion also the same for the separating process of water and salt by filtration or distillation. quick because i need to finish my hw