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(20) Calculate the number of moles of H2O formed when 0.400 mole of Ba(OH)2 is treated with 1.00 mol of HClO3 according to the chemical reaction shown below.
Ba(OH 2 + 2 HClO3 → Ba(ClO3)2 + 2 H2O
(A) 0.800 mol
(B) 0.600 mol
(C) 0.500 mol
(D) 1.00 mol
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(21) Calculate the percent yield of iron (Fe) if 850 g of Fe3O4 reacted with carbon and 435 g of Fe was actually isolated from the reaction mixture.
Fe3O4 (s) + 2 C(s) → 2 CO2 (g) + 3 Fe(s)
(A) 70.72 %
(B) 25.9 %
(C) 97.5 %
(D) 42.71%
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