Question:
Hess’s law of constant heat summation is based on:
Hess’s law of constant heat summation is based on:
Show Hint
Apply Hess’s law to calculate enthalpy changes in multi-step reactions.
Updated On: Jan 17, 2026
- Zeroth law of thermodynamics
- First law of thermodynamics
- Second law of thermodynamics
- Third law of thermodynamics
Hide Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Hess’s law relies on the conservation of energy, which is the basis of the first law. It states that the total enthalpy change in a reaction is independent of the pathway taken.
Was this answer helpful?
0
0
Top Questions on Thermodynamics
- The temperature of 5 moles of an ideal gas increases by 20 K.
Given:
$C_{p} = 9 \text{ cal mol}^{-1}\text{K}^{-1}$, $R = 2 \text{ cal mol}^{-1}\text{K}^{-1}$
The change in internal energy of the gas is:- JEE Main - 2026
- Physics
- Thermodynamics
- $4 \text{ kg}$ of water is heated from $4^\circ \text{C}$ to $20^\circ \text{C}$ at constant pressure $10^5 \text{ Pa}$ so that density changes from $1000 \text{ kg/m}^3$ to $998 \text{ kg/m}^3$. Then find $\Delta U$ (in $\text{Joules}$) given $C_v$ of $\text{H}_2\text{O}= 4.2 \text{ Joule/gm.K}$ :
- JEE Main - 2026
- Physics
- Thermodynamics
- Match List-I (Isothermal Process) with List-II (work done)
- JEE Main - 2026
- Physics
- Thermodynamics
- A brass rod is fixed rigidly at two ends at 27\(^\circ\)C. If it is cooled to temperature -43\(^\circ\)C, tension in rod becomes T\(_{0}\). Find temperature (in \(^\circ\)C) at which tension will be 1.4 T\(_{0}\) :
- JEE Main - 2026
- Physics
- Thermodynamics
- An ideal gas in a closed rigid container is at 50$^\circ$C and pressure 3.23 kPa. If temperature is doubled, find new pressure in Pa :
- JEE Main - 2026
- Physics
- Thermodynamics
View More Questions
Questions Asked in CUET PG exam
- According to Erikson's stages of Psychosocial Development, the "trust versus mistrust phase" is the developmental task of:
- CUET (PG) - 2025
- Developmental Psychology
- Fill in the blank with the appropriate word from the options given below: He, as well as his friends, ............ denied entry to the stadium.
- CUET (PG) - 2025
- Subject Verb Agreement
- Who first used the term 'Negative Capability'?
- CUET (PG) - 2025
- Literary Theory
- If \( \frac{1}{9!} + \frac{1}{10!} = \frac{x}{11!} \), then the value of \( x \) is:
- CUET (PG) - 2025
- Factorial Equations
- The genetic constitution of the combined paternal and maternal DNA responsible for producing the different ABO blood groups is referred as:
- CUET (PG) - 2025
- Forensic Biology
View More Questions