Hi i am a second year chemistry undergraduate and have a quantum mechanics assignment due in and was wondering if i could have some help on the final question.

Azulene C10H8 is an aromatic hydrocarbon containing delocalised 'pi' elctrons. As a model of this p-electron system, consider the mobile electrons to fit in a rectangular 2-D box of dimensions 5.00 x 4.65 amstrongs

i.) how many pi-electrons does azulene have?

ii.) identify the quantum numbers for the HOMO and LUMO of the of the pi-electron system.

iii) calculate the wavelength (in nm) of the lowest-energy absorption transition.

Grateful for any help you can offer. Thanks.