4. At 20 ° C and a pressure of 720 mm Hg. Art. the volume of gas is 10L. How much it takes the same amount of gas at 60 ° C and a pressure of 780 mm Hg. Art.?
24. Some elements of oxygen forms a compound so¬derzhaschee 31.58% oxygen. Calculate equivalent element.
43. The electronic element has an atomic formula of ending 3s23p2. Which email family it belongs? Describe its properties (oxidation potential, with a compound of hydrogen and oxygen, the nature of the oxide and hydroxide salt).
54. The water molecule and a molecule of carbon dioxide comprise two polar bonds each. Why polar molecule H2O, CO2 and non-polar?
63. The balance system: CO + Cl2 ↔ COCl2 set at the following values \u200b\u200bof the concentrations of reactants: [CO] = [R12] = [SOS12] = 0.001 mol / l. Calculate the equilibrium constant for this reaction, the initial concentration of carbon monoxide and chlorine.
88. How many crystalline soda Na2CO3 • 10H2O need to take to prepare 0.5 liters of 0.01 N solution.
91. AgIO3 Solubility at 18 ° C is 9,6 • 10-5 mol / L; find the solubility product of silver iodate at this temperature.
114. Make the molecular and ionic equations hydrolysis reactions following salts, said reaction medium and the pH of their solutions vod¬nyh: FeCl3, (NH4) 2S, NaCN.
124. Fill in the reactions, make a scheme moving electrons arrange ratios indicate an oxidizer and a reducing agent:
136. Calculate the charges of complex ions formed Cr (III):