A 0. 784 g sample of magnesium is added to a 250 ml flask and dissolved in 150 ml of water. Magnesium hydroxide obtained from the reaction required 215. 0 ml of 0. 300 m hydrochloric acid to completely react. If one mole of hcl reacts with one mole of hydroxide, how many moles of hydroxide must have been produced for every mole of mg that reacted?.