| ⇦ | 
| ⇨ |
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: - What is the amount of Chlorine evolved,when 2A of current is passed for 30 minutes
- If 2 g of aluminium is treated, first with excess of dilute H₂SO₄ and then
- Which of the following will show a negative deviation from Raoult’s law
- Bhor’s theory is applicable to
- In the final answer of the expression (29.2 – 20.2) (1.79 x 10⁵) / 1.37. The number
Topics: Thermodynamics
(179)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- What is the amount of Chlorine evolved,when 2A of current is passed for 30 minutes
- If 2 g of aluminium is treated, first with excess of dilute H₂SO₄ and then
- Which of the following will show a negative deviation from Raoult’s law
- Bhor’s theory is applicable to
- In the final answer of the expression (29.2 – 20.2) (1.79 x 10⁵) / 1.37. The number
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