Q1. The number of moles in 46 g of sodium (Na, atomic mass = 23) is:

1
2
3
0.5

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = mass/molar mass = 46/23 = 2 mol.

Q2. Avogadro's number is approximately:

6.022 × 10²³
6.022 × 10²²
6.022 × 10²⁴
6.022 × 10²⁰

Difficulty: Easy · Topic: Avogadro's Number

Solution

Avogadro's number N_A = 6.022 × 10²³ mol⁻¹.

Q3. The number of moles in 36 g of C (molar mass = 12 g/mol) is:

3
6
1
4

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = mass/molar mass = 36/12 = 3 mol.

Q4. The number of moles in 64 g of S (molar mass = 32 g/mol) is:

2
4
1
3

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = mass/molar mass = 64/32 = 2 mol.

Q5. The number of moles in 80 g of Ca (molar mass = 40 g/mol) is:

2
4
1
3

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = mass/molar mass = 80/40 = 2 mol.

Q6. The number of moles in 27 g of Al (molar mass = 27 g/mol) is:

1
2
0.5
2

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = mass/molar mass = 27/27 = 1 mol.

Q7. The number of moles in 180 g of C₆H₁₂O₆ (glucose) (molar mass = 180 g/mol) is:

1
2
0.5
2

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = mass/molar mass = 180/180 = 1 mol.

Q8. The number of moles in 40 g of NaOH (molar mass = 40 g/mol) is:

2
2
1
3

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 40/40 = 1.

Q9. The number of moles in 80 g of NaOH (molar mass = 40 g/mol) is:

6
2
4
3

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 80/40 = 2.

Q10. The number of moles in 20 g of NaOH (molar mass = 40 g/mol) is:

1.0
1.5
1.5
0.5

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 20/40 = 0.5.

Q11. The number of moles in 98 g of H₂SO₄ (molar mass = 98 g/mol) is:

1
2
3
2

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 98/98 = 1.

Q12. The number of moles in 196 g of H₂SO₄ (molar mass = 98 g/mol) is:

3
2
6
4

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 196/98 = 2.

Q13. The number of moles in 49 g of H₂SO₄ (molar mass = 98 g/mol) is:

1.5
1.5
0.5
1.0

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 49/98 = 0.5.

Q14. The number of moles in 36.5 g of HCl (molar mass = 36.5 g/mol) is:

2
3
2
1

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 36.5/36.5 = 1.

Q15. The number of moles in 73 g of HCl (molar mass = 36.5 g/mol) is:

6
4
3
2

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 73/36.5 = 2.

Q16. The number of moles in 18.25 g of HCl (molar mass = 36.5 g/mol) is:

1.5
1.0
1.5
0.5

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 18.25/36.5 = 0.5.

Q17. The number of moles in 58.5 g of NaCl (molar mass = 58.5 g/mol) is:

2
2
3
1

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 58.5/58.5 = 1.

Q18. The number of moles in 117 g of NaCl (molar mass = 58.5 g/mol) is:

2
6
3
4

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 117/58.5 = 2.

Q19. The number of moles in 29.25 g of NaCl (molar mass = 58.5 g/mol) is:

1.5
1.5
1.0
0.5

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 29.25/58.5 = 0.5.

Q20. The number of moles in 100 g of CaCO₃ (molar mass = 100 g/mol) is:

2
1
2
3

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 100/100 = 1.

Q21. The number of moles in 200 g of CaCO₃ (molar mass = 100 g/mol) is:

4
2
6
3

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 200/100 = 2.

Q22. The number of moles in 50 g of CaCO₃ (molar mass = 100 g/mol) is:

1.0
0.5
1.5
1.5

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 50/100 = 0.5.

Q23. The number of moles in 56 g of Fe (molar mass = 56 g/mol) is:

2
3
1
2

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 56/56 = 1.

Q24. The number of moles in 112 g of Fe (molar mass = 56 g/mol) is:

4
6
3
2

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 112/56 = 2.

Q25. The number of moles in 28 g of Fe (molar mass = 56 g/mol) is:

0.5
1.0
1.5
1.5

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 28/56 = 0.5.

Q26. The number of moles in 63.5 g of Cu (molar mass = 63.5 g/mol) is:

2
2
3
1

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 63.5/63.5 = 1.

Q27. The number of moles in 127 g of Cu (molar mass = 63.5 g/mol) is:

4
6
2
3

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 127/63.5 = 2.

Q28. The number of moles in 31.75 g of Cu (molar mass = 63.5 g/mol) is:

1.5
1.0
1.5
0.5

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 31.75/63.5 = 0.5.

Q29. The number of moles in 65 g of Zn (molar mass = 65 g/mol) is:

2
2
3
1

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 65/65 = 1.

Q30. The number of moles in 130 g of Zn (molar mass = 65 g/mol) is:

4
3
6
2

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 130/65 = 2.

Q31. The number of moles in 32.5 g of Zn (molar mass = 65 g/mol) is:

1.5
1.5
1.0
0.5

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 32.5/65 = 0.5.

Q32. The number of moles in 24 g of Mg (molar mass = 24 g/mol) is:

2
3
2
1

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 24/24 = 1.

Q33. The number of moles in 48 g of Mg (molar mass = 24 g/mol) is:

6
2
4
3

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 48/24 = 2.

Q34. The number of moles in 12 g of Mg (molar mass = 24 g/mol) is:

1.5
0.5
1.0
1.5

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 12/24 = 0.5.

Q35. The number of moles in 54 g of Al (molar mass = 27 g/mol) is:

3
2
4
6

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 54/27 = 2.

Q36. The number of moles in 13.5 g of Al (molar mass = 27 g/mol) is:

1.0
0.5
1.5
1.5

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 13.5/27 = 0.5.

Q37. The number of moles in 56 g of KOH (molar mass = 56 g/mol) is:

1
3
2
2

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 56/56 = 1.

Q38. The number of moles in 112 g of KOH (molar mass = 56 g/mol) is:

3
2
6
4

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 112/56 = 2.

Q39. The number of moles in 28 g of KOH (molar mass = 56 g/mol) is:

0.5
1.0
1.5
1.5

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 28/56 = 0.5.

Q40. The number of moles in 74 g of Ca(OH)₂ (molar mass = 74 g/mol) is:

3
1
2
2

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 74/74 = 1.

Q41. The number of moles in 148 g of Ca(OH)₂ (molar mass = 74 g/mol) is:

6
2
4
3

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 148/74 = 2.

Q42. The number of moles in 37 g of Ca(OH)₂ (molar mass = 74 g/mol) is:

0.5
1.5
1.0
1.5

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 37/74 = 0.5.

Q43. The number of moles in 17 g of NH₃ (molar mass = 17 g/mol) is:

2
3
1
2

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 17/17 = 1.

Q44. The number of moles in 34 g of NH₃ (molar mass = 17 g/mol) is:

4
6
3
2

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 34/17 = 2.

Q45. The number of moles in 8.5 g of NH₃ (molar mass = 17 g/mol) is:

0.5
1.5
1.0
1.5

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 8.5/17 = 0.5.

Q46. The number of moles in 44 g of CO₂ (molar mass = 44 g/mol) is:

3
2
1
2

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 44/44 = 1.

Q47. The number of moles in 88 g of CO₂ (molar mass = 44 g/mol) is:

3
6
4
2

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 88/44 = 2.

Q48. The number of moles in 22 g of CO₂ (molar mass = 44 g/mol) is:

1.5
1.5
0.5
1.0

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 22/44 = 0.5.

Q49. The number of moles in 18 g of H₂O (molar mass = 18 g/mol) is:

1
2
3
2

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 18/18 = 1.

Q50. The number of moles in 36 g of H₂O (molar mass = 18 g/mol) is:

2
6
4
3

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 36/18 = 2.

Q51. The number of moles in 9 g of H₂O (molar mass = 18 g/mol) is:

1.5
0.5
1.0
1.5

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 9/18 = 0.5.

Q52. The number of moles in 180 g of C₆H₁₂O₆ (molar mass = 180 g/mol) is:

2
1
3
2

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 180/180 = 1.

Q53. The number of moles in 360 g of C₆H₁₂O₆ (molar mass = 180 g/mol) is:

3
4
2
6

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 360/180 = 2.

Q54. The number of moles in 90 g of C₆H₁₂O₆ (molar mass = 180 g/mol) is:

1.5
0.5
1.5
1.0

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 90/180 = 0.5.

Q55. The number of moles in 16 g of CH₄ (molar mass = 16 g/mol) is:

2
1
3
2

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 16/16 = 1.

Q56. The number of moles in 32 g of CH₄ (molar mass = 16 g/mol) is:

6
4
2
3

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 32/16 = 2.

Q57. The number of moles in 8 g of CH₄ (molar mass = 16 g/mol) is:

1.5
1.0
0.5
1.5

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 8/16 = 0.5.

Q58. The number of moles in 46 g of C₂H₅OH (molar mass = 46 g/mol) is:

2
2
1
3

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 46/46 = 1.

Q59. The number of moles in 92 g of C₂H₅OH (molar mass = 46 g/mol) is:

4
6
2
3

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 92/46 = 2.

Q60. The number of moles in 23 g of C₂H₅OH (molar mass = 46 g/mol) is:

1.0
0.5
1.5
1.5

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 23/46 = 0.5.

Q61. The number of moles in 106 g of Na₂CO₃ (molar mass = 106 g/mol) is:

2
2
1
3

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 106/106 = 1.

Q62. The number of moles in 212 g of Na₂CO₃ (molar mass = 106 g/mol) is:

4
3
2
6

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 212/106 = 2.

Q63. The number of moles in 53 g of Na₂CO₃ (molar mass = 106 g/mol) is:

0.5
1.0
1.5
1.5

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 53/106 = 0.5.

Q64. The number of moles in 158 g of KMnO₄ (molar mass = 158 g/mol) is:

1
2
2
3

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 158/158 = 1.

Q65. The number of moles in 316 g of KMnO₄ (molar mass = 158 g/mol) is:

2
6
4
3

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 316/158 = 2.

Q66. The number of moles in 79 g of KMnO₄ (molar mass = 158 g/mol) is:

1.5
1.0
1.5
0.5

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 79/158 = 0.5.

Q67. Calculate the moles in 10.0 g of NaOH (molar mass = 40 g/mol):

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 10.0/40 = 0.25.

Q68. Calculate the moles in 20.0 g of NaOH (molar mass = 40 g/mol):

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 20.0/40 = 0.5.

Q69. Calculate the moles in 40 g of NaOH (molar mass = 40 g/mol):

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 40/40 = 1.

Q70. Calculate the moles in 60.0 g of NaOH (molar mass = 40 g/mol):

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 60.0/40 = 1.5.

Q71. Calculate the moles in 80 g of NaOH (molar mass = 40 g/mol):

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 80/40 = 2.

Q72. Calculate the moles in 120 g of NaOH (molar mass = 40 g/mol):

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 120/40 = 3.

Q73. Calculate the moles in 200 g of NaOH (molar mass = 40 g/mol):

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 200/40 = 5.

Q74. Calculate the moles in 24.5 g of H₂SO₄ (molar mass = 98 g/mol):

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 24.5/98 = 0.25.

Q75. Calculate the moles in 49.0 g of H₂SO₄ (molar mass = 98 g/mol):

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 49.0/98 = 0.5.

Q76. Calculate the moles in 98 g of H₂SO₄ (molar mass = 98 g/mol):

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 98/98 = 1.

Q77. Calculate the moles in 147.0 g of H₂SO₄ (molar mass = 98 g/mol):

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 147.0/98 = 1.5.

Q78. Calculate the moles in 196 g of H₂SO₄ (molar mass = 98 g/mol):

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 196/98 = 2.

Q79. Calculate the moles in 294 g of H₂SO₄ (molar mass = 98 g/mol):

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 294/98 = 3.

Q80. Calculate the moles in 490 g of H₂SO₄ (molar mass = 98 g/mol):

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 490/98 = 5.

Q81. Calculate the moles in 9.1 g of HCl (molar mass = 36.5 g/mol):

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 9.1/36.5 = 0.25.

Q82. Calculate the moles in 18.2 g of HCl (molar mass = 36.5 g/mol):

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 18.2/36.5 = 0.5.

Q83. Calculate the moles in 36.5 g of HCl (molar mass = 36.5 g/mol):

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 36.5/36.5 = 1.

Q84. Calculate the moles in 54.8 g of HCl (molar mass = 36.5 g/mol):

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 54.8/36.5 = 1.5.

Q85. Calculate the moles in 73.0 g of HCl (molar mass = 36.5 g/mol):

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 73.0/36.5 = 2.

Q86. Calculate the moles in 109.5 g of HCl (molar mass = 36.5 g/mol):

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 109.5/36.5 = 3.

Q87. Calculate the moles in 182.5 g of HCl (molar mass = 36.5 g/mol):

Difficulty: Easy · Topic: Mole Concept

Solution

Moles = 182.5/36.5 = 5.

Q88. Moles in 4.0g of NaOH (MM=40):

Difficulty: Easy · Topic: Mole Concept

Solution

n=4.0/40=0.1.

Q89. Moles in 10.0g of NaOH (MM=40):

Difficulty: Easy · Topic: Mole Concept

Solution

n=10.0/40=0.25.

Q90. Moles in 20.0g of NaOH (MM=40):

Difficulty: Easy · Topic: Mole Concept

Solution

n=20.0/40=0.5.

Q91. Moles in 40g of NaOH (MM=40):

Difficulty: Easy · Topic: Mole Concept

Solution

n=40/40=1.

Q92. Moles in 60.0g of NaOH (MM=40):

Difficulty: Easy · Topic: Mole Concept

Solution

n=60.0/40=1.5.

Q93. Moles in 80g of NaOH (MM=40):

Difficulty: Easy · Topic: Mole Concept

Solution

n=80/40=2.

Q94. Moles in 100.0g of NaOH (MM=40):

Difficulty: Easy · Topic: Mole Concept

Solution

n=100.0/40=2.5.

Q95. Moles in 120g of NaOH (MM=40):

Difficulty: Easy · Topic: Mole Concept

Solution

n=120/40=3.

Q96. Moles in 160g of NaOH (MM=40):

Difficulty: Easy · Topic: Mole Concept

Solution

n=160/40=4.

Q97. Moles in 200g of NaOH (MM=40):

Difficulty: Easy · Topic: Mole Concept

Solution

n=200/40=5.

Q98. Moles in 400g of NaOH (MM=40):

Difficulty: Easy · Topic: Mole Concept

Solution

n=400/40=10.

Q99. Moles in 9.8g of H₂SO₄ (MM=98):

Difficulty: Easy · Topic: Mole Concept

Solution

n=9.8/98=0.1.

Q100. Moles in 24.5g of H₂SO₄ (MM=98):

Difficulty: Easy · Topic: Mole Concept

Solution

n=24.5/98=0.25.

Q101. Moles in 49.0g of H₂SO₄ (MM=98):

Difficulty: Easy · Topic: Mole Concept

Solution

n=49.0/98=0.5.

Q102. Moles in 98g of H₂SO₄ (MM=98):

Difficulty: Easy · Topic: Mole Concept

Solution

n=98/98=1.

Q103. Moles in 147.0g of H₂SO₄ (MM=98):

Difficulty: Easy · Topic: Mole Concept

Solution

n=147.0/98=1.5.

Q104. Moles in 196g of H₂SO₄ (MM=98):

Difficulty: Easy · Topic: Mole Concept

Solution

n=196/98=2.

Q105. Moles in 245.0g of H₂SO₄ (MM=98):

Difficulty: Easy · Topic: Mole Concept

Solution

n=245.0/98=2.5.

Q106. Moles in 294g of H₂SO₄ (MM=98):

Difficulty: Easy · Topic: Mole Concept

Solution

n=294/98=3.

Q107. Moles in 392g of H₂SO₄ (MM=98):

Difficulty: Easy · Topic: Mole Concept

Solution

n=392/98=4.

Q108. Moles in 490g of H₂SO₄ (MM=98):

Difficulty: Easy · Topic: Mole Concept

Solution

n=490/98=5.

Q109. Moles in 980g of H₂SO₄ (MM=98):

Difficulty: Easy · Topic: Mole Concept

Solution

n=980/98=10.

Q110. Moles in 3.7g of HCl (MM=36.5):

Difficulty: Easy · Topic: Mole Concept

Solution

n=3.7/36.5=0.1.

Q111. Moles in 9.1g of HCl (MM=36.5):

Difficulty: Easy · Topic: Mole Concept

Solution

n=9.1/36.5=0.25.

Q112. Moles in 18.2g of HCl (MM=36.5):

Difficulty: Easy · Topic: Mole Concept

Solution

n=18.2/36.5=0.5.

Q113. Moles in 36.5g of HCl (MM=36.5):

Difficulty: Easy · Topic: Mole Concept

Solution

n=36.5/36.5=1.

Q114. Moles in 54.8g of HCl (MM=36.5):

Difficulty: Easy · Topic: Mole Concept

Solution

n=54.8/36.5=1.5.

Q115. Moles in 73.0g of HCl (MM=36.5):

Difficulty: Easy · Topic: Mole Concept

Solution

n=73.0/36.5=2.

Q116. Moles in 91.2g of HCl (MM=36.5):

Difficulty: Easy · Topic: Mole Concept

Solution

n=91.2/36.5=2.5.

Q117. Moles in 109.5g of HCl (MM=36.5):

Difficulty: Easy · Topic: Mole Concept

Solution

n=109.5/36.5=3.

Q118. Moles in 146.0g of HCl (MM=36.5):

Difficulty: Easy · Topic: Mole Concept

Solution

n=146.0/36.5=4.

Q119. Moles in 182.5g of HCl (MM=36.5):

Difficulty: Easy · Topic: Mole Concept

Solution

n=182.5/36.5=5.

Q120. Moles in 365.0g of HCl (MM=36.5):

Difficulty: Easy · Topic: Mole Concept

Solution

n=365.0/36.5=10.

Q121. Moles in 5.9g of NaCl (MM=58.5):

Difficulty: Easy · Topic: Mole Concept

Solution

n=5.9/58.5=0.1.

Q122. Moles in 14.6g of NaCl (MM=58.5):

Difficulty: Easy · Topic: Mole Concept

Solution

n=14.6/58.5=0.25.

Q123. Moles in 29.2g of NaCl (MM=58.5):

Difficulty: Easy · Topic: Mole Concept

Solution

n=29.2/58.5=0.5.

Q124. Equivalent weight of H₂SO₄ in the reaction H₂SO₄ → 2H⁺ + SO₄²⁻ is:

98
49
32.67
196

Difficulty: Easy-Medium · Topic: Equivalent Weight

Solution

Equivalent weight = Molecular weight / basicity = 98/2 = 49.

Q125. The empirical formula of a compound containing 40% carbon, 6.67% hydrogen, and 53.33% oxygen is:

CHO
CH₂O
C₂H₄O₂
CH₃O

Difficulty: Easy-Medium · Topic: Empirical Formula

Solution

C: 40/12 = 3.33, H: 6.67/1 = 6.67, O: 53.33/16 = 3.33. Ratio = 1:2:1. Formula = CH₂O.

Chapter 1: Some Basic Concepts

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