Magnesium reacts with hydrochloric acid to form hydrogen gas according to the equation below. If sufficient hydrochloric acid is used to react completely with 72.9 g of magnesium, calculate how many moles of hydrogen gas (H2) will be produced. Use the stoichiometry road map to first convert the mass of Mg into moles of Mg

Ms. sullivan's class is designing a miniature roller coaster. after first setting it up, they find that it didn't have enough speed to go through the loop de loop. instead of taking out the loop, they decide to increase the height of the first hill the coaster goes down, and this adds the speed needed to make it through the loop. what would be a drawback to this plan in real life? a) no one likes loop de loops. b) there is no downside to this plan. c) a higher hill means a scarier ride. d) a higher hill takes more time and material to build.