A hydrogen atom in an excited state absorbs a photon of wavelength 1097 nm. What were the initial and final states of the hydrogen atom

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?

Find the number of moles of argon in 364g of argon.

In which block of the periodic table is uranium (u) found? s blockd blockp blockf block