The octahedral complex [Co(H2O)6]3 has an absorption at 549 nm. Based on this where do you think the absorption will be for [Co(NH3)6]3 might be

I'm not sure but i will try to find out

The correct answer should be "electrons orbit the nucleus in circular motions exactly as shown on the classic bohr model."

Green is technically every other color but green but the other wavelengths of the other colors get absorbed by the object and the wavelength of the color green gets reflected

Molarity is moles of solute over liters of solution. idk if that is what you are talking about, but you can convert moles of solute to grams of solute using dimensional analyzes by using molar mass found on the periodic table.