If you are given 720.00 Grams of Oxygen how many moles of Oxygen will you have?

Which statement is true about ionic compounds?

Why does his teacher ask him to balance the equation by including the correct coefficient

Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?