Solution of the variant 58 KR №1 - chemisty Shimanovich
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The decision of the test No. 1 of option 58 of the collection of chemistry Shimanovich I.E.
(formatted in Microsoft Word)
Tasks:
9. The neutralization of 9.797 g of phosphoric acid consumed 7.998 g of NaOH. Calculate the equivalent, equivalent mass and basicity of H3PO4 in this reaction. Based on the calculation, write the reaction equation. Answer: 0.5 mol, 49 g / mol, 2
21. Write the electronic formulas of atoms of elements with serial numbers 9 and 28. Show the distribution of electrons of these atoms over quantum cells. Which electronic family does each of these elements belong to?
43. What is electronegativity? How does the electronegativity of p-elements change in the period, in the group of the periodic system, with an increase in the serial number? Why?
62. What covalent bond is called polar? What is a quantitative measure of the polarity of a covalent bond? Based on the values of the electronegativity of the atoms of the corresponding elements? determine which of the bonds: HI, ICI, BrF - is the most polar.
87. Crystalline ammonium chloride is formed by the interaction of gaseous ammonia and hydrogen chloride. Write the thermochemical equation for this reaction by calculating its thermal effect. How much heat will be released if 10 liters of ammonia were consumed in the reaction in terms of normal conditions? Answer: 78.97 kJ
103. Reduction of Fe3O4 with carbon monoxide proceeds according to the equation:
Fe3O4 (c) + CO (g) = 3FeO (c) + CO2 (g)
Calculate Go298 and draw a conclusion about the possibility of spontaneous flow
this reaction under standard conditions. What is Sо298 in this process?
Answer: +24.19 kJ; +31.34 J / (mol * K).
128. In the homogeneous system CO + Cl2 COCl2 equilibrium concentrations of reactants: [CO] = 0.2 mol / l; [Cl2] = 0.3 mol / L; [COCl2] = 1.2 mol / l. Calculate the equilibrium constant of the system and the initial concentrations of chlorine and CO. Answer: K = 20; [Cl] ref = 1.5 mol / l; [CO] ref = 1.4 mol / l.
145. Calculate the molar, equivalent and molal concentration of a 16% solution of aluminum chloride with a density of 1.149 g / cm3
Answer: 1.38 M; 4.14 n .; 1.43 m.
166. Calculate the molar mass of a nonelectrolyte, knowing that a solution containing 2.25 g of this substance in 250 g of water crystallizes at -0.279 ° C. The cryoscopic constant of water is 1.86 °. Answer: 60 g / mol
188. Write molecular and ion-molecular equations of reactions of interaction in solutions between a) Sn (OH) 2 and HCl; b) BeSO4 and KOH; c) NH4Cl and Ba (OH) 2.
218. What is the pH value (> 7 <) have the solutions of the following salts: K3PO4, Pb (NO3) 2, Na2S? Make up the ionic-molecular and molecular equations for the hydrolysis of these salts.
(formatted in Microsoft Word)
Tasks:
9. The neutralization of 9.797 g of phosphoric acid consumed 7.998 g of NaOH. Calculate the equivalent, equivalent mass and basicity of H3PO4 in this reaction. Based on the calculation, write the reaction equation. Answer: 0.5 mol, 49 g / mol, 2
21. Write the electronic formulas of atoms of elements with serial numbers 9 and 28. Show the distribution of electrons of these atoms over quantum cells. Which electronic family does each of these elements belong to?
43. What is electronegativity? How does the electronegativity of p-elements change in the period, in the group of the periodic system, with an increase in the serial number? Why?
62. What covalent bond is called polar? What is a quantitative measure of the polarity of a covalent bond? Based on the values of the electronegativity of the atoms of the corresponding elements? determine which of the bonds: HI, ICI, BrF - is the most polar.
87. Crystalline ammonium chloride is formed by the interaction of gaseous ammonia and hydrogen chloride. Write the thermochemical equation for this reaction by calculating its thermal effect. How much heat will be released if 10 liters of ammonia were consumed in the reaction in terms of normal conditions? Answer: 78.97 kJ
103. Reduction of Fe3O4 with carbon monoxide proceeds according to the equation:
Fe3O4 (c) + CO (g) = 3FeO (c) + CO2 (g)
Calculate Go298 and draw a conclusion about the possibility of spontaneous flow
this reaction under standard conditions. What is Sо298 in this process?
Answer: +24.19 kJ; +31.34 J / (mol * K).
128. In the homogeneous system CO + Cl2 COCl2 equilibrium concentrations of reactants: [CO] = 0.2 mol / l; [Cl2] = 0.3 mol / L; [COCl2] = 1.2 mol / l. Calculate the equilibrium constant of the system and the initial concentrations of chlorine and CO. Answer: K = 20; [Cl] ref = 1.5 mol / l; [CO] ref = 1.4 mol / l.
145. Calculate the molar, equivalent and molal concentration of a 16% solution of aluminum chloride with a density of 1.149 g / cm3
Answer: 1.38 M; 4.14 n .; 1.43 m.
166. Calculate the molar mass of a nonelectrolyte, knowing that a solution containing 2.25 g of this substance in 250 g of water crystallizes at -0.279 ° C. The cryoscopic constant of water is 1.86 °. Answer: 60 g / mol
188. Write molecular and ion-molecular equations of reactions of interaction in solutions between a) Sn (OH) 2 and HCl; b) BeSO4 and KOH; c) NH4Cl and Ba (OH) 2.
218. What is the pH value (> 7 <) have the solutions of the following salts: K3PO4, Pb (NO3) 2, Na2S? Make up the ionic-molecular and molecular equations for the hydrolysis of these salts.
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