How many grams of MgO are formed from 2.3 moles of magnesium and excess oxygen?

Ineed this asap part i: scientific method what is the difference between science and pseudoscience? what is the scientific method?

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?

What occurs when a cell engulfs large food particals