I need assistance. Calling all chemistry people I need someone to explain to me how I would determine the percent yield of magnesium oxide from the given reaction to determine if it is a useful commercial process

Ibeg i need 20. a reaction produces 4.93 l of oxygen, but was supposed to produce 1 mol of oxygen. what is the percent yield?

Joe shines white light into a bowl half full of water at an angle of incident of 27.5°. calculate the angle of refraction in the water given the indices of refraction for air and water are 1.00 and 1.36, respectively.

Stage in which a star’s outer layers have started to cool and grow outward?