Potassium permanganate reacts with oxalic acid (H2C2O4) in aqueous sulfuric acid according to the following reaction:   2 KMnO4(aq) + 5 H2C2O4(aq) + 3 H2SO4(aq) 2 MnSO4·H2O(s) + K2SO4(aq) + 10 CO2(g) + 6 H2O(l)   The reaction is run a second time and 8.74 g of MnSO4·H2O are obtained. What volume of carbon dioxide gas is collected at 1.01 bar and 23˚C? Answer in L with the correct number of significant figures; do not use scientific notation.

Using the reaction 2Al(s) + 3CuCl2·2H2O(aq) -> 3Cu(s) + 2AlCl3(aq) + 6H2O(l), determine the oxidation numbers and the oxidizating and reducing agents.

To measure the amount of calcium carbonate (CaCO3) in a seashell, an analytical chemist crushes a 4.30 g sample of the shell to a fine powder and titrates it to the endpoint with 233. mL of 0.2700M hydrogen chloride (HCI) solution. The balanced chemical equation for the reaction is: 2HCl(aq) + CO3(aq) → H₂CO3(aq) + 2Cl(aq) 19 0 What kind of reaction is this? O precipitation O acid-base redox X olo If you said this was a precipitation reaction, enter the chemical formula of the precipitate. 0 Ar If you said this was an acid-base reaction, enter the chemical formula of the reactant that is acting as the base. If you said this was a redox reaction, enter the chemical symbol of the element that is oxidized. Calculate the mass percent of CaCO3 in the sample. Be sure your answer has 3 significant digits. П 0 0% S ?

Chlorine can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric acid, HC1(aq), as described by the chemical equation MnO, (s) + 4 HCI(aq) → MnCl,(aq) + 2 H,O(1) + Cl, (g) How much MnO, (s) should be added to excess HCl(aq) to obtain 345 mL Cl, (g) at 25 °C and 765 Torr? mass of MnO,: