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How many liters of H2 would be formed at 588 mm Hg and 17 ∘C if 23.5 g of zinc was allowed to react? What is the molality of a solution contains 15 grams of solute is 500 grams of solvent? What is a good website for maths word problem for kindergarten students? Need to find the solutions to |2x| + y = 1 and x + 2y = -1? X elevado a +3 presenta 72 electrones, cual es el numero atomico?