Where is a similar fraction 5/3 2/7 1/6 and 7/9​ sorry if I touch chemistry it supposed to be math

An empty fuel tank can still contain and therefore can be even more dangerous than one full of liquid fuel.

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

Kc = 0.040 for the system below at 450oc. if a reaction is initiated with 0.40 mole of cl2 and 0.40 mole of pcl3 in a 2.0 liter container, what is the equilibrium concentration of cl2 in the same system? pcl5(g) ⇄ pcl3(g) + cl2(g)