Calculate the number of molecules in 54,0 g of water,

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Explain that newton first law,second law and third law of motion?

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?

Can someone me with 3 and 4 plz. this is for masteries test.