An unknown substance was put in a container. The substance filled up the container from bottom up, taking half of the space in the container. What is most likely the state of matter of the substance?

Gas
Liquid
Plasma
Solid

Determine the wavelength of the light absorbed when an electron in a hydrogen atom makes a transition from an orbital in the n=3 level to an orbital in the n=7 level.

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?

Chlorine and water react to form hydrogen chloride and oxygen, like this: 2cl2 (g) + 2h2o (g) → 4hcl (g) + o2 (g) also, a chemist finds that at a certain temperature the equilibrium mixture of chlorine, water, hydrogen chloride, and oxygen has the following composition: compound concentration at equilibrium cl2 0.55m h2o 0.57m hcl 0.53m o2 0.34m calculate the value of the equilibrium constant kc for this reaction. round your answer to 2 significant digits.