1.Which of the following particle diagrams best represents the products when four molecules of H2O2(l) decompose into water and oxyen gas at room temperature?
2.The masses of carbon and hydrogen in samples of four pure hydrocarbons are given above.The hydrocarbon in which sample has the same empirical formula as propene,C3H6?
Na2S2O3(aq) + 4 NaOCl(aq) + 2 NaOH(aq) → 2 Na2SO4(aq) + 4 NaCl(aq) + H2O(l)
1. A student performs an experiment to determine the value of the enthalpy change, △H°rxn, for the oxidation-reduction reaction represented by the balanced equation above.
(a) Determine the oxidation number of Cl in NaOCl .
(b) Calculate the number of grams of Na2S2O3 needed to prepare 100.00 mL of 0.500 M Na2S2O3(aq).
In the experiment, the student uses the solutions shown in the table below.
(c) Using the balanced equation for the oxidation-reduction reaction and the information in the table above,determine which reactant is the limiting reactant. Justify your answer.
The solutions, all originally at 20.0°C, are combined in an insulated calorimeter. The temperature of the reaction mixture is monitored, as shown in the graph below.
(d) According to the graph, what is the temperature change of the reaction mixture?
(e) The mass of the reaction mixture inside the calorimeter is 15.21 g.
The student repeats the experiment, but this time doubling the volume of each of the reactants, as shown in the table below.
(f) The magnitude of the enthalpy change, △H°rxn , in kJ/molrxn , calculated from the results of the second experiment is the same as the result calculated in part (e)(ii) . Explain this result.
(g) Write the balanced net ionic equation for the given reaction.