⇦ | ⇨ |
Standard enthalpy of vaporisation Δvap H⁰ for water at 100⁰C is 40.66 kJ mol⁻¹. The internal energy of vaporisation of water at 100⁰C (in kJ mol⁻¹) is
Options
(a) 37.56
(b) -43.76
(c) 43.76
(d) 40.66
Correct Answer:
37.56
Explanation:
ΔvapH⁰ = 40.66 kJ mol⁻¹,
T = 100 + 273 = 373K,
ΔE = ? , ΔH = ΔE + Δn(g)RT ⇒
ΔE = ΔH – Δn(g) RT,
Δn(g) = number of gaseous moles of products – number of gaseous moles of reactants, H₂O(l) ⇌ H₂O(g), Δn(g) = 1 – 0 = 1, ΔE = ΔH -RT , ΔE = ( 40.66 X 10³) – (8.314 X 373), ΔE = 37559 J/mol or 37.56 kJ/mol.
Related Questions: - Lanthanide contraction is due to increase in
- If 30 mL of H₂ and 20 mL of O₂ reacts to form water. what is left at the end
- An electron with values 4,1,-1 and +1/2 for the set of four quantum numbers
- Silver sulphide dissolves in a solution of sodium cyanide to form the complex
- Treatment of cyclopentanone with methyl lithium gives which of the following species
Topics: Thermodynamics
(179)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Lanthanide contraction is due to increase in
- If 30 mL of H₂ and 20 mL of O₂ reacts to form water. what is left at the end
- An electron with values 4,1,-1 and +1/2 for the set of four quantum numbers
- Silver sulphide dissolves in a solution of sodium cyanide to form the complex
- Treatment of cyclopentanone with methyl lithium gives which of the following species
Topics: Thermodynamics (179)
Subject: Chemistry (2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply