हिंदी

Answer the following in one or two sentences. State second law of thermodynamics in terms of entropy. - Chemistry

Advertisements
Advertisements

प्रश्न

Answer the following in one or two sentences.

State second law of thermodynamics in terms of entropy.

टिप्पणी लिखिए
Advertisements

उत्तर १

Statement: “The second law of thermodynamics states that total entropy of a system and its surroundings increases in a spontaneous process.”

For the process to be spontaneous,

`triangle "S"_"total" = triangle "S"_"sys" + triangle "S"_"surr"` > 0.

shaalaa.com

उत्तर २

Second law of thermodynamics in terms of entropy:
The second law of thermodynamics states that, “The total entropy of the system and its surroundings (universe) increases in a spontaneous process”.

shaalaa.com
Spontaneous (Irreversible) Process
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 4: Chemical Thermodynamics - Exercises [पृष्ठ ८७]

APPEARS IN

बालभारती Chemistry [English] Standard 12 Maharashtra State Board
अध्याय 4 Chemical Thermodynamics
Exercises | Q 2.6 | पृष्ठ ८७

संबंधित प्रश्न

In which of the following, entropy of the system decreases?


Answer the following in one or two sentences.

State whether ΔS is positive, negative or zero for the reaction 2H(g)  →  H2(g). Explain.


Answer the following in one or two sentences.

Comment on the spontaneity of reactions for which ∆H is positive and ∆S is negative.


Obtain the relationship between ∆G° of a reaction and the equilibrium constant.


Answer the following question.

Obtain the relation between ΔG and `triangle "S"_"total"`. Comment on the spontaneity of the reaction.


For a process, entropy change of a system is expressed as ________.


In how many of the following, ∆S is positive?

i. Melting of ice

ii. Sublimation of iodine

iii. Dissolution of CuSO4 in water

iv. Condensation of water vapour

v. Dissociation of H2 molecule into atoms

vi. Conversion of carbon dioxide gas to dry ice

vii. Vaporization of acetone


Which one of the following has ΔS0 greater than zero?


For the following reaction:

\[\ce{Fe2O3_{(s)} + 3CO_{(g)} -> 2Fe_{(s)} + 3CO2_{(g)}}\]; ΔH0 = −29.8 kJ and ΔS0 = 15 J K−1. What is the value of \[\ce{ΔS_{(total)}}\] at 298 K?


Heat of combustion of C(s), H2(g) and C2H6(g) are −x1, −x2 and −x3 respectively. Hence heat of formation of C2H6(g) is ____________.


Which of the following conditions indicates the reaction is spontaneous?


Which of following is residual entropy of a substance?


Standard molar entropy is ______.


Calculate the amount of heat liberated during formation of 2. 7 kg of water if heat of formation of water is - 284.5 kJ mol-1.


The equilibrium constant for a reaction is 10, value of ΔG° at 300 K is (R = 8 × 10-3 kJ)


For a reaction ΔH = - 30kJ and ΔS = - 45 JK-1, at what temperature reaction changes from spontaneous to non-spontaneous?


For which of the following reaction, ΔH = ΔU?


Relation between ΔH and ΔU for the reaction, \[\ce{2SO_{3(g)} -> 2SO_{2(g)} + O_{2(g)}}\] is _______.


Identify the unit used for measurement of energy according to international system of units?


A reaction is spontaneous at low temperatures but non-spontaneous at high temperatures. Which of the following is true for the reaction?


The criterion for a spontaneous process is ______.


Dinitrogen and dioxygen combined to form nitrous oxide in equilibrium at 850 K. The equilibrium constant for this reaction is 0.56. If the equilibrium concentration of nitrous oxide gas is 3 × 10-3 M and both dinitrogen and dioxygen have the same concentration, then what will be the concentration of dinitrogen gas in M?


Write the correct condition for spontaneity in terms of Gibbs energy.


Identify whether the following pair have a larger entropy or not. If yes then Why?

O2{g) at 1 atm or O2(g) at 10 atm both at the same temperature.


Identify whether the following pair have a larger entropy or not. If yes then Why?

C2H5OH(l) or C2H5OH(g)


Write the relationship between Gibbs energy change for a process and total entropy change of system and surroundings.


Calculate ΔG for ΔH = − 110 kJ, ΔS = + 40 J K−1 at 400 K.


Find out the value of equilibrium constant for the following reaction at 298 K, \[\ce{2NH3_{(g)} + CO2_{(g)} ⇌ NH2 - COONH2_{(aq)} + H2O_{(l)}}\] Gibbs Standard energy change 298 K = –13.6 kJ mol−1.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×