Iron in the form FeCl2 can be determined by titration with potassium dichromate: 16) 6FeCl2(aq) + K2CriO7(aq) + 14HCl(aq) - 6FeC13(aq) + 2CrC13(aq) + 2KCl(aq) + 7H2O(l) An iron sample of mass 0.800 g required 18.80 mL of 0.0120 M K2CQO7(aq) to reach the end point. How n1c1ny moles of FeCl2 were in the sample?

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The equation below shows a chemical reaction. a + b + heat —> c + d according to the law of conservation of energy, which statement is true? a. the reactants absorb heat because they have less energy than the products. b. the products release heat because they have more energy than the reactants. c. the reactants generate heat because they have more energy than the products. d. the products require heat to form because they have less energy than the reactants.