How many litres of water must be added to 3.9 litres of NaОН solution with the titer 0.02034 to receive 0.05 M solution?

1. 36
2. 99
3. 25
4. 67
5. 50

133. How many grams of KCl are necessary to be added to 450 g of 8 % solution of the same salt to receive 12 % solution?

1. 20
2. 30
3. 42
4. 11
5. 25

134. How many kg of water is it necessary to add to 1 kg of 40 % solution of the sulfuric acid to receive 25 % solution?

1. 0.6
2. 2.0
3. 1.0
4. 0.5
5. 1.5

135. How many mole of water should be added to 1.6 kg of 25 % NaOH solution to receive 16 % solution?

1. 50
2. 20
3. 30
4. 10
5. 60

136. 300 g of 40 % solution of the sulfuric acid and 700 g of 10 % solution of the same acid are mixed; calculate the mass fraction (%) of the received solution.

1. 19
2. 25
3. 11
4. 38
5. 48

137. How many grams of 32 % solution of nitric acid are necessary to be added to 600 g of 80 % solution of the same acid to receive 64 % solution?

1. 300
2. 500
3. 100
4. 400
5. 200

138. 300 kg of water was evaporated from 750 kg of 48 % solution of the sulfuric acid, determine the mass fraction (%) of sulfuric acid in the received solution.

1. 80
2. 100
3. 60
4. 50
5. 30

139. How many kg of water is it necessary to evaporate from 1 тon of 60 % sulfuric acid solution to receive 96 % solution?

1. 375
2. 450
3. 300
4. 200
5. 350

140. It is necessary to prepare 1 М solution from 1 kg of 63 % nitric acid solution, determine the volume (litres) of the received solution.

1. 10
2. 20
3. 15
4. 30
5. 35

141. It is necessary to prepare 1 M solution of HCI from 20 ml of 20 % HCl (density 1.1), determine the volume (ml) of the received solution.

1. 120.5
2. 100.5
3. 142.3
4. 101.9
5. 115.0

142. It is necessary to prepare 1 M H₃PO₄ solution from 120 ml of 30 % H₃PO₄ (density 1.19), determine the volume (ml) of the received solution.

1. 437
2. 500
3. 425
4. 378
5. 516

143. 800 ml of 3 M КОН solution and 1.2 litres of 12 % КОН solution (density 1.1) are mixed; calculate the molar concentration of the received solution.

1. 2.6
2. 3.0
3. 2.1
4. 0.8
5. 1.5

144. 3 litres of 0.1 M H₃PO₄ solution and 2 litres of 9 % solution of the same acid (density 1.05) are mixed; calculate the normal concentration of the received solution.

1. 1.34
2. 2.25
3. 0.78
4. 1.98
5. 2.15

145. How many ml of 20 % HCl solution (density 1.1) should be added to 4 litres of 0.6 M HCl solution to receive 1 M solution?

1. 320
2. 450
3. 125
4. 350
5. 170

146. How many litres of 0.2 M NH₃ solution are necessary to be added to 20 ml of 35 % NH₃ solution (density 0.88) to receive 0.5 M solution?

1. 1.2
2. 1.8
3. 0.9
4. 0.5
5. 1.6

147. How many litres of 0.1 n. solution of the sulfuric acid is it possible to prepare from 70 ml of 50 % solution of the same acid (density 1.4)?

1. 10
2. 20
3. 30
4. 40
5. 50

148. How many litres of 8 M NaOH is it possible to prepare from 1 kg of 42 % NaOH solution?

1. 1.3
2. 2.5
3. 0.9
4. 2.7
5. 3.1

149. How many litres of 8 M NaOH is it possible to prepare from 1 litre of 42 % NaOH solution (density 1.45)?

1. 1.9
2. 2.5
3. 0.6
4. 2.8
5. 0.2

150. How many ml of 40 % solution of the phosphoric acid (density 1.25) are required for preparation of 400 ml of 0.25 M solution of the same acid?

1. 19.6
2. 21.0
3. 15.3
4. 11.5
5. 21.8

151. How many ml of 40 % phosphoric acid solution (density 1.25) are required for preparation of 3 litres of 0.15 n. solution of the same acid?

1. 29
2. 35
3. 16
4. 13
5. 33

152. Calculate the thermal effect of reaction (кJ) of methanol synthesis from hydrogen and carbon oxide on solid catalyst at 298К 2Н₂ (г) +СО → СН₃ОН (г), if = – 201,2 кJ/mol; DН⁰_{f(CO )} = – 110,5 кJ/mol;

A) –90,7

B) 311,7

C) 90,2

D) 60,9

E) –73,2

 

153. Determine thermal effect of reaction: СН º СН + СО + Н₂О (ж) → СН₂=СНСООН (ж) at standard pressure if warmth of formation is known

Substance	[kJ/mol ]
СН º СН	226,75
СО	–110,50
Н2О (ж)	–285,84
СН2 = СНСООН (ж)	–384,37

A) -214,78

B) 107,36

C) 1007,36

D) –623,09

E) –154,2

 

154. To calculate thermal effect of reaction (kJ) at Т=298К CuCl₂ + Zn = ZnCl₂ + Cu Values are resulted in the table:

Substance
ZnCl2	–478,2
CuCl2	–262,3

A) -215,9

B) 740,5

C) –903,6

D) 904,2

E) 370,2

 

155. Calculate entropy change under standard conditions for reaction 2H₂S + SO₂ = 2 Н₂О (ж) + 3S. Values S are given in the table.

Substance	[J/mol×К]
Н2О	69,96
S	32,55
SO2	248,1
H2S	205,64

A) –421,81

B) –102,50

C) 513,24

D) 350,72

E) 231,11

 

156. Calculate thermal effect of reaction (кJ) at Т=298К, Р=1,013×10⁵ Па

Cd (тв) + 2AgCl (тв) = 2Ag (тв) + CdCl₂ (тв), if warmth of formation of substances are known

Substance	298 [kJ/mol ]
Сd
Ag
AgCl	–126,8
CdCl2	–389,0

 

 

A) –135,4

B) –263,2

C) –515,8

D) 443,2

E) 344,8

 

157. Calculate standard change of energy of Gibbs (kJ) for reaction Cd (тв) + 2AgCl (тв) = 2Ag (тв) + CdCl₂ (тв),

if are known DН₂₉₈ = –135,4 kJ; DS₂₉₈ = –76,84 J/К.

A) –112,5

B) 1393,55

C) –141,7

D) 24,61

E) 41,42

 

158. Calculate standard change of entropy for reaction H_2(г)+ O_2(г) H₂O_ж under standard conditions:

Substance	S [J/mol К]
H2	130.6
O2	205.03
H2O	69.96

A) -163.155 J/к

B) 144.39 J/к

C) 450.59 J/к

D) 370.25 J/к

E) 265.67 J/к

 

159. Calculate standard thermal effect (kJ/mol) reactions of dissolution of zinc in the diluted water solution copper vitriol Zn_(т)+CuSO₄=Cu_(т)+ZnSO₄; DH _ZnSO4=-978,2 kJ/mol; kJ/mol.

A) -207,1;

B) -211,66;

C) -316,1;

D) 213,61;

E) 166,19;

 

160. Calculate thermal effect of reaction (kJ/mol) synthesis methanol from hydrogen and carbon oxide on the solid catalyst at 298 K 2H_2(г)+CO_(г) → CH₃OH_(г), =- 201,2 kJ/mol; kJ/mol.

A) -90,7;

B) -60,9;

C) -90,2;

D) -73,2;

E) -86,1;

 

161. Define thermal effect of chemical reaction at 298 K CH₃OH_(г)+3/2 O₂ → CO₂+2H₂O_(г), if

-201,2 кJ/mol, -393,51 кJ/mol, -241,84 кJ/mol:

A) -675,99 кJ/mol;

B) 398,11 кJ/mol;

C) 1764,2 кJ/mol;

D) -575,25 кJ/mol;

E) -834,78 кJ/mol;

 

162. Calculate thermal effect of reaction (kJ/mol) synthesis methanol from hydrogen and carbon oxide on the solid catalyst at 298 K 2H_2(г)+CO_2(г) → CH₃OH_(г), -201,2 кJ/mol, -110.5 кJ/mol:

A) -90,7;

B) -60,9;

C) -90,2;

D) -73,2;

E) 86,1;

 

163. Define standard change of entropy for reaction: C₂H₂+2H₂O_(ж) → CH₃COOH_(ж)+H₂,

200,8 J/mol×К, 69,96 J/mol×К, 159,8 J/mol×К, 130,6 J/mol×К:

A) -50,32 J/mol×К;

B) -65,48 J/mol×К;

C) -45,93 J/mol×К;

D) -33,75 J/mol×К;

E) -74,18 J/mol×К;

 

164. Calculate energy of Gibbs (J/mol) under standard conditions for reaction: C₂H₂+2H₂O_(ж) → CH₃COOH_(ж)+H₂, 209,25 ×10³ J/mol, -237,2310³ J/mol, -389,36×10³ J/mol, 0

A) -124,15×10³;

B) -113,61×10³;

C) -121,53×10³;

D) -135,93×10³;

E) -109,15×10³;

 

165. Calculate thermal effect of reaction under standard conditions for reaction: C₂H₂+2H₂O_(ж) → CH₃COOH_(ж)+H₂,

226,75 ×10³ J/mol, -285,84×10³ J/mol, -484,9×10³ J/mol, 0:

A) -139,97×10³ J/mol;

B) -145,32×10³ J/mol;

C) -151,64×10³ J/mol;

D) 125,86×10³ J/mol;

E) 108,52×10³ J/mol;

 

166. Calculate ΔU under standard conditions for reaction: C₂H₂+2H₂O_(ж) → CH₃COOH_(ж)+H₂

at 298,2 К and 139,97 ×10³ J/mol:

A) 139,97 ×10³ J/mol;

B) 145,32 ×10³ J/mol;

C) 151,64 ×10³ J/mol;

D) 125,86×10³ J/mol;

E) 108,52×10³ J/mol;