Solution of the variant 49 KR №1 - chemisty Shimanovich
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The decision of the test No. 1 of option 49 of the collection of chemistry Shimanovich I.E.
(formatted in Microsoft Word)
Tasks:
10. What is equal to at n.u. equivalent volume of oxygen? The combustion of 1.5 g of bivalent metal requires 0.69 liters of oxygen (n.o.). Calculate the equivalent mass, molar mass and atomic mass of this metal.
32. Write the electronic formulas of atoms, elements with serial numbers 15 and 28. What is the maximum spin of p-electrons for atoms of the first and d-electrons for atoms of the second element?
54. What is the lowest oxidation state of hydrogen, fluorine, sulfur and nitrogen? Why? Make formulas of calcium compounds with these elements in this oxidation state. What are the corresponding connections called?
76. Draw an energy diagram of the formation of the molecular ion H2 and the H2 molecule by the method of molecular orbitals. Where is the communication energy greater? Why?
97. The reaction of ammonia combustion is expressed by the thermochemical equation:
4NH3 (g) + 3O2 (g) = 2N2 (g) + 6H20 (g); H = -1530.28 kJ.
Calculate the heat of formation of NH3 (g).
Answer: -46.19 kJ / mol.
118. Determine at what temperature the reaction of Fe3O4 reduction will begin, proceeding according to the equation:
Fe3O4 (q) + CO (g) = 3FeO (q) + CO2 (g); DH = +34.55 kJ. Answer: 1102.4 K.
139. Why does the equilibrium of the N2 + 3H2 2NH3 system shift when the pressure changes and the equilibrium of the N2 + O2 2NO system does not shift? Motivate your answer on the basis of calculating the speed of forward and reverse reactions in these systems before and after the pressure change. Write expressions for the equilibrium constants of each of these systems.
156. What mass of NaNO3 should be dissolved in 400 g of water to prepare a 20% solution? Answer: 100 g.
178. When 2.3 g of a certain non-electrolyte is dissolved in 125 g of water, the crystallization temperature decreases by 0.372 °. Calculate the molar mass of the solute. The cryoscopic constant of water is 1.86 °. Answer: 92 g / mol.
198. Make molecular and ion-molecular equations of reactions of interaction in solutions between:
a) FeCl3 and KOH;
b) NiSO4 and (NH4) 2S;
c) MgCO3 and HNO3.
209. What is the pH value (> 7 <) have solutions of Na3PO4, K2S, CuSO4 salts? Make up the ionic-molecular and molecular equations for the hydrolysis of these salts.
(formatted in Microsoft Word)
Tasks:
10. What is equal to at n.u. equivalent volume of oxygen? The combustion of 1.5 g of bivalent metal requires 0.69 liters of oxygen (n.o.). Calculate the equivalent mass, molar mass and atomic mass of this metal.
32. Write the electronic formulas of atoms, elements with serial numbers 15 and 28. What is the maximum spin of p-electrons for atoms of the first and d-electrons for atoms of the second element?
54. What is the lowest oxidation state of hydrogen, fluorine, sulfur and nitrogen? Why? Make formulas of calcium compounds with these elements in this oxidation state. What are the corresponding connections called?
76. Draw an energy diagram of the formation of the molecular ion H2 and the H2 molecule by the method of molecular orbitals. Where is the communication energy greater? Why?
97. The reaction of ammonia combustion is expressed by the thermochemical equation:
4NH3 (g) + 3O2 (g) = 2N2 (g) + 6H20 (g); H = -1530.28 kJ.
Calculate the heat of formation of NH3 (g).
Answer: -46.19 kJ / mol.
118. Determine at what temperature the reaction of Fe3O4 reduction will begin, proceeding according to the equation:
Fe3O4 (q) + CO (g) = 3FeO (q) + CO2 (g); DH = +34.55 kJ. Answer: 1102.4 K.
139. Why does the equilibrium of the N2 + 3H2 2NH3 system shift when the pressure changes and the equilibrium of the N2 + O2 2NO system does not shift? Motivate your answer on the basis of calculating the speed of forward and reverse reactions in these systems before and after the pressure change. Write expressions for the equilibrium constants of each of these systems.
156. What mass of NaNO3 should be dissolved in 400 g of water to prepare a 20% solution? Answer: 100 g.
178. When 2.3 g of a certain non-electrolyte is dissolved in 125 g of water, the crystallization temperature decreases by 0.372 °. Calculate the molar mass of the solute. The cryoscopic constant of water is 1.86 °. Answer: 92 g / mol.
198. Make molecular and ion-molecular equations of reactions of interaction in solutions between:
a) FeCl3 and KOH;
b) NiSO4 and (NH4) 2S;
c) MgCO3 and HNO3.
209. What is the pH value (> 7 <) have solutions of Na3PO4, K2S, CuSO4 salts? Make up the ionic-molecular and molecular equations for the hydrolysis of these salts.
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