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If 0.24g of a volatile liquid upon vapourization gives 45ml of vapours at NTP. What will be the vapour density of the substance? (Density of H = 0.089 gL⁻1)
  • a)
    95.39
  • b)
    5.993
  • c)
    95.93
  • d)
    56.0
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
If 0.24g of a volatile liquid upon vapourization gives 45ml of vapours...
Given:
- Mass of volatile liquid = 0.24 g
- Volume of vapours = 45 mL
- Density of hydrogen = 0.089 g/L

To Find:
Vapour density of the substance

Solution:

1. Convert volume of vapours to volume at STP
- NTP = 1 atm and 298 K
- STP = 1 atm and 273 K
- Using the Combined Gas Law,
(P1 x V1)/T1 = (P2 x V2)/T2
- P1 = P2 = 1 atm
- T1 = 298 K
- T2 = 273 K
- V1 = 45 mL
- V2 = ?

(V1/T1) = (V2/T2)
V2 = (V1 x T2)/T1
V2 = (45 mL x 273 K)/298 K
V2 = 41.15 mL

2. Convert mass to moles
- Molar mass of substance = ?
- Let's assume the substance is a hydrocarbon
- So, molar mass = (12 x a) + (1 x b)
- where a and b are the number of carbon and hydrogen atoms respectively
- Let's assume the substance has 1 carbon and 4 hydrogen atoms
- Molar mass = (12 x 1) + (1 x 4) = 16 g/mol
- Moles of substance = mass/molar mass
- Moles of substance = 0.24 g/16 g/mol
- Moles of substance = 0.015 mol

3. Calculate Vapour density
- Vapour density = (Molar mass of substance/2) x (Volume of vapours/Volume at STP)
- Vapour density = (16 g/mol/2) x (45 mL/41.15 mL) x (1 L/1000 mL) x (1/0.089 g)
- Vapour density = 56.0

Therefore, the Vapour density of the substance is 56.0.
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If 0.24g of a volatile liquid upon vapourization gives 45ml of vapours...
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Direction: Read the passage given below and answer the following questions: Boiling point or freezing point of liquid solution would be affected by the dissolved solids in the liquid phase. A soluble solid in solution has the effect of raising its boiling point and depressing its freezing point. The addition of non-volatile substances to a solvent decreases the vapour pressure and the added solute particles affect the formation of pure solvent crystals. According to many researches the decrease in freezing point directly correlated to the concentration of solutes dissolved in the solvent. This phenomenon is expressed as freezing point depression and it is useful for several applications such as freeze concentration of liquid food and to find the molar mass of an unknown solute in the solution. Freeze concentration is a high quality liquid food concentration method where water is removed by forming ice crystals. This is done by cooling the liquid food below the freezing point of the solution. The freezing point depression is referred as a colligative property and it is proportional to the molar concentration of the solution (m), along with vapour pressure lowering, boiling point elevation, and osmotic pressure. These are physical characteristics of solutions that depend only on the identity of the solvent and the concentration of the solute. The characters are not depending on the solute’s identity. Q.When a non volatile solid is added to pure water it will

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If 0.24g of a volatile liquid upon vapourization gives 45ml of vapours at NTP. What will be the vapour density of the substance? (Density of H = 0.089 gL⁻1)a)95.39b)5.993c)95.93d)56.0Correct answer is option 'D'. Can you explain this answer?
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If 0.24g of a volatile liquid upon vapourization gives 45ml of vapours at NTP. What will be the vapour density of the substance? (Density of H = 0.089 gL⁻1)a)95.39b)5.993c)95.93d)56.0Correct answer is option 'D'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about If 0.24g of a volatile liquid upon vapourization gives 45ml of vapours at NTP. What will be the vapour density of the substance? (Density of H = 0.089 gL⁻1)a)95.39b)5.993c)95.93d)56.0Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for If 0.24g of a volatile liquid upon vapourization gives 45ml of vapours at NTP. What will be the vapour density of the substance? (Density of H = 0.089 gL⁻1)a)95.39b)5.993c)95.93d)56.0Correct answer is option 'D'. Can you explain this answer?.
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