To explain why solids expand (get bigger) when heated, and contract (get smaller) when cooled.

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?

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How many moles of water are created if 3 moles of hydrogen react completely with excess oxygen?