What mass of 2nan3 is necessary to produce 70.0 l of n2 gas at 315k and 1.2 atm

In numbering carbon atoms in the parent chain of a hydrocarbon, why would you number from right to left, rather than left to right

Asample of freon gas has a volume of 2.23 liters, a pressure of 4.85 kpa, and a temperature of -1.36°c. calculate the volume at a pressure of 1.38 kpa and a temperature of 5.5°c. (show work)

Scientists discovered fossils in several layers of the earth you see here. they found fossils of algae, snails, and clams in layer d. given that information, where do you think they found fossil evidence of simple land plants and amphibians?