OnlineCBT Logo OnlineCBT
⚲
हिन्दी
OnlineCBT Logo OnlineCBT
⚲

Chemistry · THERMODYNAMICS

हिन्दी

When a balanced thermochemical equation is multiplied by a factor of 2, the numerical value of its standard enthalpy of reaction (\( \Delta_r H^\ominus \)):

  1. A
    Remains unchanged
  2. B
    Becomes half
  3. C
    Is squared
  4. D
    Is doubled
View Answer & Solution

Correct answer · Option D

Is doubled

Explanation

Enthalpy is an extensive property; multiplying the stoichiometric coefficients by 2 also multiplies the enthalpy of reaction by 2.

Related questions

At 298 K, 18 g of liquid water evaporates into steam. Given \( \Delta_{\text{vap}}H^\ominus = 44.01\text{ kJ mol}^{-1} \) and \( R = 8.314\text{ J K}^{-1}\text{mol}^{-1} \), the internal energy of vaporisation (\( \Delta_{\text{vap}}U^\ominus \)) is approximately:→Which of the following substances has a standard molar enthalpy of formation (\( \Delta_f H^\ominus \)) equal to zero at 298 K and 1 bar by convention?→For the reaction \( 4\text{Fe}(s) + 3\text{O}_2(g) \rightarrow 2\text{Fe}_2\text{O}_3(s) \) at \( 298\text{ K} \), \( \Delta_r H^\circ = -1648\text{ kJ mol}^{-1} \) and \( \Delta_r S^\circ = -549.4\text{ J K}^{-1}\text{mol}^{-1} \). What is the total entropy change \( \Delta S_{\text{total}} \)?→2.0 moles of liquid water at \( 100^\circ\text{C} \) is completely converted to ice at \( 0^\circ\text{C} \) at 1 bar pressure. Given that the heat capacity of liquid water is \( 4.2\text{ J g}^{-1\,\circ}\text{C}^{-1} \) and the enthalpy of fusion of ice is \( 6.00\text{ kJ mol}^{-1} \), the total enthalpy change (\( \Delta H \)) for this process is:→
OnlineCBT

Our mission is "To educate students and help them excel in competitive exam preparation to the best of their potential. To impart good values in students and develop their overall exam readiness."

Useful Link
Important Pages
Courses & Practice
Contact
Address

Plot No 10, Dholigumti, Panditpura Road, Bandikui, Dausa(Raj) 303313

Contact

+91 7877547686

 E-mail

onlinecbtportal@gmail.com

 Helpline Number

+91 7877547686
Share
Click To Download
Get it on Google Play

ऐप डाउनलोड करने
के लिए Google Play पर
उपलब्ध है

Terms of Use | Privacy Policy | Cookie Policy | Disclaimer | Editorial Policy | Fact Check | Corrections | DMCA | Ad Choices

Copyright © 2026 - OnlineCBT.in. All Rights Reserved.

WhatsApp Chat