Which of the following is the correct balanced chemical reaction for the given word equation:
lithium oxide plus nitrogen gas yields lithium nitride plus oxygen

An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.