⇦ | ⇨ |
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 approximate percentage of H₂O₂ in a sample labelled as 10 V?
- A dibromo derivative of an alkane reacts with sodium metal to form an alicyclic
- If 900 J/g of heat is exchanged at boiling point of water, then what is increase
- Solubility of the alkaline earth’s metal sulphates in water decreases in the
- The boiling point of 0.2 mol kg⁻¹ solution of X in water is greater than equimolal
Topics: Thermodynamics
(179)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- What is the approximate percentage of H₂O₂ in a sample labelled as 10 V?
- A dibromo derivative of an alkane reacts with sodium metal to form an alicyclic
- If 900 J/g of heat is exchanged at boiling point of water, then what is increase
- Solubility of the alkaline earth’s metal sulphates in water decreases in the
- The boiling point of 0.2 mol kg⁻¹ solution of X in water is greater than equimolal
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