| ⇦ | 
| ⇨ |
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: - The number of optical isomers formed by hydrogenation of the compound (CH₃)₂C=CHCH₃
- Mercurous chloride exists in the form of
- In Friedel-Craft’s alkylation, besides AlCl₃ the other reactants are
- A reaction occurs spontaneously is
- C₆H₆ consists of one ring,while naphthalene consists of two rings. Both
Topics: Thermodynamics
(179)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The number of optical isomers formed by hydrogenation of the compound (CH₃)₂C=CHCH₃
- Mercurous chloride exists in the form of
- In Friedel-Craft’s alkylation, besides AlCl₃ the other reactants are
- A reaction occurs spontaneously is
- C₆H₆ consists of one ring,while naphthalene consists of two rings. Both
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