Solution of the variant 48 KR №1 - chemisty Shimanovich
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Solution of test work No. 1 of option 48 of the collection of chemistry Shimanovich I.E
(formatted in Microsoft Word)
Tasks:
9. 2.48 g of monovalent metal oxide contains 1.84 g of metal. Calculate the equivalent masses of the metal and its oxide. What is the molar and atomic mass of this metal?
31. The isotope carbon-11 is formed when protons bombard the nuclei of nitrogen-14 atoms. Make the equation for this nuclear reaction and write it in abbreviated form.
53. Based on the oxidation state of the atoms of the corresponding elements, give a motivated answer to the question: which of the two hydroxides is the stronger base: CuOH or Cu (OH) 2; Fe (OH) 2 or Fe (OH) 3; Sn (OH) 2 or Sn (OH) 4? Write the reaction equations proving the amphotericity of tin (II) hydroxide.
75. What forces of molecular interaction are called orientational, inductive and dispersive? When do these vultures appear and what is their nature?
96. Calculate the thermal effect and write the thermochemical equation of the combustion reaction of 1 mol of ethane C2H6 (g), which results in the formation of water vapor and carbon dioxide. How much heat will be released during the combustion of 1 m3 of ethane in terms of normal conditions? Answer: 63742.86 kJ.
117. Based on the standard heats of formation and the absolute standard entropies of the corresponding "substances, calculate the Gо298 of the reaction proceeding according to the equation:
С2Н4 (g) 3О2 (g) = 2СО2 (g) 2Н2О (l)
Is this reaction possible under standard conditions?
Answer: -1331.21 kJ
138. At a certain temperature, the equilibrium of the homogeneous system 2NO О2 2NO2 was established at the following concentrations of reactants: [NO] p = 0.2 mol / l; [O2] p = 0.1 mol / L; [NO2] p = 0.1 mol / L. Calculate the equilibrium constant and the initial concentration of NO and O2.
Answer: K = 2.5; [NO] ref = 0.3 mol / l; [O2] ref = 0.15 mol / l.
155. What mass of HNO3 was contained in the solution if it took 35 cm3 of 0.4 N to neutralize it? NaOH solution? What is the titer of a NaOH solution? Answer: 0.882 g, 0.016 g / cm3
177. How many grams of urea (NH2) 2CO should be dissolved in 250 g of water to raise the boiling point by 0.26 °? Ebullioscopic water constant 0.52 °. Answer: 7.5 g
197. Make up the molecular and ion-molecular equations of interaction reactions in solutions between:
a) H2SO4 and Ba (OH) 2;
b) FeCl3 and NH4OH;
c) CH3COONa and HCl.
208. Make up the ionic-molecular and molecular equations of hydrolysis of salts of NSOOK, ZnSO4,
A1 (NO3) 3. What is the pH value (> 7 <) have solutions of these salts?
(formatted in Microsoft Word)
Tasks:
9. 2.48 g of monovalent metal oxide contains 1.84 g of metal. Calculate the equivalent masses of the metal and its oxide. What is the molar and atomic mass of this metal?
31. The isotope carbon-11 is formed when protons bombard the nuclei of nitrogen-14 atoms. Make the equation for this nuclear reaction and write it in abbreviated form.
53. Based on the oxidation state of the atoms of the corresponding elements, give a motivated answer to the question: which of the two hydroxides is the stronger base: CuOH or Cu (OH) 2; Fe (OH) 2 or Fe (OH) 3; Sn (OH) 2 or Sn (OH) 4? Write the reaction equations proving the amphotericity of tin (II) hydroxide.
75. What forces of molecular interaction are called orientational, inductive and dispersive? When do these vultures appear and what is their nature?
96. Calculate the thermal effect and write the thermochemical equation of the combustion reaction of 1 mol of ethane C2H6 (g), which results in the formation of water vapor and carbon dioxide. How much heat will be released during the combustion of 1 m3 of ethane in terms of normal conditions? Answer: 63742.86 kJ.
117. Based on the standard heats of formation and the absolute standard entropies of the corresponding "substances, calculate the Gо298 of the reaction proceeding according to the equation:
С2Н4 (g) 3О2 (g) = 2СО2 (g) 2Н2О (l)
Is this reaction possible under standard conditions?
Answer: -1331.21 kJ
138. At a certain temperature, the equilibrium of the homogeneous system 2NO О2 2NO2 was established at the following concentrations of reactants: [NO] p = 0.2 mol / l; [O2] p = 0.1 mol / L; [NO2] p = 0.1 mol / L. Calculate the equilibrium constant and the initial concentration of NO and O2.
Answer: K = 2.5; [NO] ref = 0.3 mol / l; [O2] ref = 0.15 mol / l.
155. What mass of HNO3 was contained in the solution if it took 35 cm3 of 0.4 N to neutralize it? NaOH solution? What is the titer of a NaOH solution? Answer: 0.882 g, 0.016 g / cm3
177. How many grams of urea (NH2) 2CO should be dissolved in 250 g of water to raise the boiling point by 0.26 °? Ebullioscopic water constant 0.52 °. Answer: 7.5 g
197. Make up the molecular and ion-molecular equations of interaction reactions in solutions between:
a) H2SO4 and Ba (OH) 2;
b) FeCl3 and NH4OH;
c) CH3COONa and HCl.
208. Make up the ionic-molecular and molecular equations of hydrolysis of salts of NSOOK, ZnSO4,
A1 (NO3) 3. What is the pH value (> 7 <) have solutions of these salts?
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