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CBSE Class 11-science Answered

what is the diference between entropy and enthalpy?
what is the gibbs energy?
Asked by svmic.dbr | 09 Jan, 2015, 10:33: PM
answered-by-expert Expert Answer
  • Entropy is basically a term for disorder or randomness while enthalpy is defined as the total heat content of a system at constant pressure equivalent to sum of internal energy and pressure-volume energy is called the enthalpy of the system and is given by the following equation

             H = U + PV,
             Here U is the internal energy.

  •  S.I. unit of Entropy is Joules per Kelvin while S. I. unit of enthalpy is Joule per kilogram.

 The Gibbs free energy of a system at any moment in time is defined as the enthalpy of the system minus the product of the temperature times the    entropy of the system.

G = H - TS

Answered by Arvind Diwale | 11 Jan, 2015, 08:53: PM

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CBSE 11-science - Chemistry
the total entropy change for system it's sourunding increase if process is
Asked by mankdubey670 | 06 Jun, 2022, 01:27: PM
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write a relation between delta G and Q and define the meaning of each term and answer the following a) why a reaction proceeds forward when Q< K and no net reaction occurs when Q = K b) explain the effect of increase in pressure in terms of reaction quotient Q for the reaction CO ⇆ CH4(g) + H2O(g) (ii) for the reaction, N2(g) +3H2(g)⇆ 2NH(g) at 400K , Kp = 41, find the value Kp for the reaction 2N2(g) +6H2(g) ⇆ 4NH3(g)
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CBSE 11-science - Chemistry
Give the relationship between Gibbs energy change and equilibrium constant?
Asked by Topperlearning User | 14 Aug, 2014, 04:44: PM
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CBSE 11-science - Chemistry
What is the relation between Syntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '.?
Asked by Topperlearning User | 15 Jun, 2016, 05:46: PM
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At what temperature the entropy of a perfectly crystalline substance is zero?
Asked by Topperlearning User | 14 Aug, 2014, 04:51: PM
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For a reaction, Determine the temperature above which reaction will be spontaneous.
Asked by Topperlearning User | 14 Aug, 2014, 04:53: PM
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Calculate the entropy of vaporization of water if its enthalpy of vaporization is 186.5 kJmol-1?
Asked by Topperlearning User | 14 Aug, 2014, 05:00: PM
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CBSE 11-science - Chemistry
For a water gas reaction at 1000°C the standard Gibb’s energy change is -8.1 kJ mol-1. Calculate the value of equilibrium constant?
Asked by Topperlearning User | 15 Jun, 2016, 05:46: PM
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CBSE 11-science - Chemistry
Calculate the standard Gibbs energy change for the following reaction: Syntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '. Given that Syntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '. for Cu2+(aq) and Zn2+(aq) as 65 kJ mol-1 and -147.2 kJ mol-1 respectively.
Asked by Topperlearning User | 23 Sep, 2014, 03:28: PM
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For the reaction: Syntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '. Calculate the temperature at which Gibbs energy change ΔG is equal to zero. Predict the nature of the reaction at this temperature and above it.
Asked by Topperlearning User | 23 Sep, 2014, 03:39: PM
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