Unit of normal concentration

1. mol/l
2. g/ml
3. mg / l
4. g/l
5. %

Unit of a mass fraction

A. %

B. mol/l

C. g/ml

D. mg / l

E. g/l

Unit of the number of substance A

1. mol
2. g
3. there is no unit
4. mol/l
5. g/mol

Unit of the number of equivalents of substance A

A. mol

B. g

C. there is no unit

D. mol/l

E. g/mol

Unit of an equivalent of substance A

1. there is no unit
2. mol/l
3. g/mol
4. mol
5. g

Unit of the molar mass of the substance A

1. g/mol
2. there is no unit
3. mol/l
4. mol
5. g

Unit of the molar mass of an equivalent of the substance A

1. g/mol
2. there is no unit
3. mol/l
4. mol
5. g

Unit of a number of equivalence of the substance A

1. there is no unit
2. mol/l
3. g/mol
4. mol
5. g

Unit of the factor of equivalence

1. there is no unit
2. mol/l
3. g/mol
4. mol
5. g

Unit of a density of a solution A

1. g/ml
2. g
3. mol/l
4. mg / mol
5. there is no unit

Unit of the mass of the substance A

1. g
2. mol/l
3. mg / l
4. there is no unit
5. g/ml

24. Specify the molecular mass of air

А) 29 g/mole

В) 16 g/mole

С) 2 g/mole

D) 32 g/mole

25. Specify the molar volume of a gas at normal condition

А) 22,4

В) 2,24

С) 224

D) 0,224

Е) 0,02

26. Define the number of equivalence of the phosphoric acid for the following reaction: H₃PO₄+NaOH=NaH₂PO₄+H₂O

1. 1
2. 1/2
3. 2
4. 1/3
5. 3

27. Determine the equivalent of soda for the reaction: Na₂CO₃ + 2 HCI = 2 NaCI + CO₂ + H₂O

1. 1/2 Na₂CO₃
2. 2
3. 1/2
4. Na₂CO₃
5. 3

28. Determine the equivalent of soda for the reaction: Na₂CO₃ + HCI = NaHCO₃ + NaCI

1. Na₂CO₃
2. 1/2 Na₂CO₃
3. 2
4. 1/2
5. 3

29. Determine the number of equivalence of soda for the reaction: Na₂CO₃ + 2 HCI = 2 NaCI + CO₂ + H₂O

1. 2
2. HCI
3. 1/2
4. 1
5. Na₂CO₃

30. Determine the factor of equivalence of soda for the reaction: Na₂CO₃ + 2 HCI = 2 NaCI + CO₂ + H₂O

1. 1/2
2. 1
3. Na₂CO₃
4. HCI
5. 2

31. Determine the number of equivalence of soda for the reaction: Na₂CO₃ + HCI = NaHCO₃ + NaCI

1. 1
2. 1/2
3. 1/3
4. 2
5. 3

32. Determine the factor of equivalence of soda for the reaction: Na₂CO₃ + HCI = NaHCO₃ + NaCI

A. 1

B. 1/2

C. 1/3

D. 2

E. 3

33. Determine the equivalent of permanganate ion for the reaction: MnO₄^-+ 8 H ⁺ + 5 e = Mn^{2 +} + 4 H₂O

1. 1/5 MnO₄^-
2. MnO₄^-
3. 1/2
4. 1/7
5. 1/2 Mn^{2 +}

34. Determine the equivalent of iron for the reaction: 5 Fe^{2 +} + MnO₄^-+ 8 H ⁺ = 5 Fe^{3 +} + Mn^{2 +} + 4 H₂O

1. Fe
2. 1/2 Fe
3. 1/2
4. 1/3 Fe
5. 1

35. Determine the equivalent of dichromate ion for the reaction: Cr₂O₇^2-+ 14 H ⁺ + 6 e = 2 Cr^{3 +} + 7 H₂O

1. 1/6 Cr₂O₇^2-
2. 1/6
3. 1/3
4. Cr₂O₇^2-
5. 1/3 Cr₂O₇^2-

36. Determine the equivalent of calcium phosphate for the reaction: 3 Ca^{2 +} + 2 PO₄^3- = Ca₃ (PO₄) ₂

1. 1/6 Ca₃ (PO₄) ₂
2. 1/3
3. 1/6
4. 1/3Ca₃ (PO₄) ₂
5. Ca₃ (PO₄) ₂

37. Determine the number of equivalence of permanganate ion for the reaction: MnO₄ ^-+ 8 H ⁺ + 5 e = Mn^{2 +} + 4 H₂O

1. 5
2. 1/5 MnO₄^-
3. MnO_4-
4. 1/2
5. 2

38. Determine the factor of equivalence of permanganate ion for the reaction: MnO₄^-+ 8 H ⁺ + 5 e = Mn^{2 +} + 4 H₂O

1. 1/5
2. 1/5 MnO₄^-
3. MnO₄^-
4. 1/2
5. 1/7

39. Determine the number of equivalence of iron for the reaction: 5 Fe^{2 +} + MnO₄^-+ 8 H ⁺ = 5 Fe^{3 +} + Mn^{2 +} + 4 H₂O

1. 1
2. Fe
3. 1/2 Fe
4. 1/2
5. 3

40. Determine the factor of equivalence of iron for the reaction: 5 Fe^{2 +} + MnO₄^-+ 8 H ⁺ = 5 Fe^{3 +} + Mn^{2 +} + 4 H₂O

1. 1
2. Fe
3. 1/2 Fe
4. 1/2
5. 1/3 Fe

41. Determine the number of equivalence of dichromate ion for the reaction: Cr₂O₇^2-+ 14 H ⁺ + 6 e = 2 Cr^{3 +} + 7 H₂O

A. 6

B. 1/6 Cr₂O₇^2-

C. 3

D. 1/6

E. 1/3 Cr₂O₇^2-

42. Determine the factor of equivalence of dichromate ion for the reaction: Cr₂O₇^2- + 14 H ⁺ + 6 e = 2 Cr^{3 +} + 7 H₂O

A. 1/6

B. 6

C. 1/3

D. Cr₂O₇^2-

E. 1/3 Cr₂O₇^2-

43. Determine the number of equivalence of calcium phosphate for the reaction: 3 Ca^{2 +} + 2 PO₄^3- = Ca₃ (PO₄) ₂

1. 6
2. 1/6 Ca₃ (PO₄) ₂
3. 1/3
4. 3
5. 1/3Ca₃ (PO₄) ₂

44. Determine the factor of equivalence of calcium phosphate for the reaction: 3 Ca^{2 +} + 2 PO₄^3- = Ca₃ (PO₄) ₂

1. 1/6
2. 1/3
3. 6
4. 1/3Ca₃ (PO₄) ₂
5. Ca₃ (PO₄) ₂

45. Calculate the normal concentration of 12 % H₂SO₄ (density 1.080).

1. 2.6
2. 1.0
3. 3.5
4. 6.0
5. 5.0

46. Calculate the mass fraction (%) of the 6.5 M phosphoric acid (density 1.32).

A. 48.3

B. 53.1

C. 25.3

D. 17.8

E. 33.5

47. Calculate the mass fraction (%) of the sulfuric acid in its 10 n. solution (density 1.29).

1. 38
2. 30
3. 41
4. 29
5. 56

48. Calculate the mass fraction (%) of HCl in its 7.98 M solution (density 1.13).

1. 26
2. 18
3. 9
4. 30
5. 20

49. Calculate the mass fraction (%) of HNO₃ in its 4.85 M solution (density 1.16).

1. 26
2. 18
3. 11
4. 32
5. 21

50. Calculate the mass fraction (%) of КОН in its 8.55 M solution (density 1.35).

1. 35.5
2. 42.1
3. 26.8
4. 30.7
5. 40.5

51. Calculate the mass fraction (%) of NaOH in its 0.7 M solution (density 1.03).

1. 2.7
2. 1.5
3. 1.0
4. 3.2
5. 2.0

52. Calculate the mass fraction (%) of Na₂CO₃ in its 3.07 n. solution (density 1.15).

1. 14
2. 24
3. 10
4. 12
5. 13

53. Calculate the mass fraction (%) of NH₃ in its 14.8 M solution (density of 0.9g/ml).

1. 28
2. 20
3. 17
4. 32
5. 15

Calculate the normal concentration of the sulfuric acid if its titer is equal 0.02446 g/ml.

1. 0.4988
2. 0.5321
3. 0.1954
4. 0.2555
5. 0.7820

Calculate the molar concentration of sodium hydroxide if its titer is equal 0.004020 g/ml.

1. 0.1005
2. 0.4563
3. 0.5619
4. 0.6721
5. 0.2968

Calculate the titer of the sulfuric acid, if its normal concentration is 0.1008 mol/l.

1. 0.004943
2. 0.001115
3. 0.007819
4. 0.003985
5. 0.006178

Calculate the titer of sodium hydroxide, if its molar concentration is 0.09981 mol/l.

1. 0.003992
2. 0.007881
3. 0.001078
4. 0.002354
5. 0.005541

Calculate the molar concentration of the sulfuric acid if its titer is equal 0.004852 g/ml.

1. 0.04947
2. 0.01591
3. 0.07895
4. 0.06341
5. 0.02317

Calculate the normal concentration of the sulfuric acid if its titer is equal 0.004852 g/ml

1. 0.09895
2. 0.04563
3. 0.07811
4. 0.05560
5. 0.06113

The titer of the hydrochloric acid is equal to 0.003592 g/ml, determine the molar concentration of the solution.