20+ points
balance the equation, if necessary, for the reaction between iron and oxygen
( see attachment)
if you could with both problems that would be great, !

An aqueous solution of potassium hydroxide is standardized by titration with a 0.194 m solution of hydrobromic acid. if 25.2 ml of base are required to neutralize 24.2 ml of the acid, what is the molarity of the potassium hydroxide solution? m potassium hydroxide

Asolution contains 180 g of glucose (c6h12o6) and 162 g of water. what is the mole fraction of glucose?

Compare and contrast physical changes with chemical changes.