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If 50 gm oleum sample rated as 118% is mixed with 18 gm water, then the correct option is
  • a)
    The resulting solution contains 18 gm of water and 118 gm H2SO4
  • b)
    The resulting solution contains 9 gm of water and 59 gm H2SO4
  • c)
    The resulting solution contains only 118 gm pure H2SO4
  • d)
    The resulting solution contains 68 gm of pure H2SO4
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
If 50 gm oleum sample rated as 118% is mixed with 18 gm water, then th...
118 % ⇒ 100 g sample uses 18 g water
⇒ 50 g sample need 9 g water
(50 g + 18 g water)
⇒ 59 g H2SO4 + 9 g water
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Most Upvoted Answer
If 50 gm oleum sample rated as 118% is mixed with 18 gm water, then th...
Calculation of the Resulting Solution

Given:
Mass of oleum sample = 50 g
Oleum sample rating = 118%
Mass of water added = 18 g

1. Calculation of the mass of H2SO4 in the oleum sample
- The oleum sample rating of 118% means that 100 g of the sample contains 118 g of pure H2SO4.
- Therefore, the mass of pure H2SO4 in the 50 g oleum sample is:
= (118/100) x 50 g
= 59 g

2. Calculation of the total mass of H2SO4 in the resulting solution
- When the oleum sample is mixed with water, it reacts to form H2SO4 and heat is evolved. The equation is:
H2SO4 + H2O → H2SO4.H2O + Heat
- The resulting solution contains H2SO4 and H2SO4.H2O.
- However, H2SO4.H2O is unstable and decomposes to H2SO4 and H2O. Therefore, the resulting solution eventually contains only H2SO4.
- The total mass of H2SO4 in the resulting solution is:
= Mass of H2SO4 in oleum sample + Mass of H2SO4 formed from H2SO4.H2O
= 59 g + Mass of H2SO4 formed from H2SO4.H2O

3. Calculation of the mass of water in the resulting solution
- The mass of water in the resulting solution is the same as the mass of water added initially.
- Therefore, the mass of water in the resulting solution is 18 g.

4. Calculation of the mass of H2SO4 formed from H2SO4.H2O
- The molar mass of H2SO4.H2O is 98 g/mol.
- The molar mass of H2SO4 is 98 g/mol.
- Therefore, the mass of H2SO4 formed from 1 g of H2SO4.H2O is 98/98 = 1 g.
- The mass of H2SO4 formed from H2SO4.H2O in the resulting solution is:
= (Mass of H2SO4.H2O in the resulting solution) x (Mass of H2SO4 formed from 1 g of H2SO4.H2O)
= (Mass of H2SO4.H2O in the resulting solution) g

5. Calculation of the mass of H2SO4.H2O in the resulting solution
- The mass of H2SO4.H2O in the resulting solution can be calculated by assuming that all the water added initially reacts with H2SO4 to form H2SO4.H2O.
- The equation for the reaction is:
H2SO4 + H2O → H2SO4.H2O + Heat
- The molar mass of H2SO4 is 98 g/mol.
- The molar mass of H2O is 18 g/mol.
- Therefore, the molar mass of H2SO4.H2O is 98 + 18 + 16 + 16 + 16 = 164 g/mol.
- The number of moles of H2SO4 in the oleum sample is:
= Mass of H2
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If 50 gm oleum sample rated as 118% is mixed with 18 gm water, then the correct option isa)The resulting solution contains 18 gm of water and 118 gm H2SO4b)The resulting solution contains 9 gm of water and 59 gm H2SO4c)The resulting solution contains only 118 gm pure H2SO4d)The resulting solution contains 68 gm of pure H2SO4Correct answer is option 'B'. Can you explain this answer?
Question Description
If 50 gm oleum sample rated as 118% is mixed with 18 gm water, then the correct option isa)The resulting solution contains 18 gm of water and 118 gm H2SO4b)The resulting solution contains 9 gm of water and 59 gm H2SO4c)The resulting solution contains only 118 gm pure H2SO4d)The resulting solution contains 68 gm of pure H2SO4Correct answer is option 'B'. Can you explain this answer? for Class 11 2024 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about If 50 gm oleum sample rated as 118% is mixed with 18 gm water, then the correct option isa)The resulting solution contains 18 gm of water and 118 gm H2SO4b)The resulting solution contains 9 gm of water and 59 gm H2SO4c)The resulting solution contains only 118 gm pure H2SO4d)The resulting solution contains 68 gm of pure H2SO4Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 11 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for If 50 gm oleum sample rated as 118% is mixed with 18 gm water, then the correct option isa)The resulting solution contains 18 gm of water and 118 gm H2SO4b)The resulting solution contains 9 gm of water and 59 gm H2SO4c)The resulting solution contains only 118 gm pure H2SO4d)The resulting solution contains 68 gm of pure H2SO4Correct answer is option 'B'. Can you explain this answer?.
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