How many moles are present in 5.24 x 1023 molecules of CH4?

Determine the number o moles of ions/atoms/particle in the following: 2.50 miles of k2s (let me know how to do)

It takes 945.kj/mol to break a nitrogen-nitrogen triple bond. calculate the maximum wavelength of light for which a nitrogen-nitrogen triple bond could be broken by absorbing a single photon.

Scientific evidence tells us that the cause of earths four season is the tilt of earth as it revolves around the sun. the student is instructed to illustrate this information in a science notebook. how will the student illiterate winter in the northern hemisphere?