What is the mass of 3.5 moles of Li2O ?

Balance this equation co2(g) + h2o (g) show that the balanced equation obeys the law if conversation of mass

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

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?