Advertisements
Advertisements
प्रश्न
Answer the following in one or two sentences.
State second law of thermodynamics in terms of entropy.
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.
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”.
APPEARS IN
संबंधित प्रश्न
In which of the following, entropy of the system decreases?
Answer the following in one or two sentences.
If the enthalpy change of a reaction is ∆H how will you calculate the entropy of surroundings?
Answer the following in one or two sentences.
Comment on the spontaneity of reactions for which ∆H is positive and ∆S is negative.
Answer the following question.
Although ΔS for the formation of two moles of water from H2 and O2 is –327J K–1, it is spontaneous. Explain.
(Given ΔH for the reaction is –572 kJ).
Answer the following question.
Obtain the relation between ΔG and `triangle "S"_"total"`. Comment on the spontaneity of the reaction.
Answer the following question.
Determine whether the following reaction is spontaneous under standard state conditions.
2H2O(l) + O2(g) → 2H2O2(l)
if ΔH° = 196 kJ, ΔS° = –126 J/K, does it have a cross-over temperature?
Equilibrium constant for a reaction is 20. What is the value of ΔG° at 300 K? (R = 8 x 10-3 kJ)
For a process, entropy change of a system is expressed as ________.
For a reversible spontaneous change, ∆S is ____________.
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
In which of the following, ∆S is positive?
Which one of the following has ΔS0 greater than zero?
At what temperature, a chemical reaction will have the following values of ∆G, ∆S and ∆H?
∆G = −5.2 KJ mol−1, ∆H = 145.6 kJ mol−1, ∆S = −216 kJ mol−1
Standard molar entropy is ______.
For which of the following reaction, ΔH = ΔU?
The criterion for a spontaneous process is ______.
Write the correct condition for spontaneity in terms of Gibbs energy.
Identify whether the following pair have larger entropy or not. If yes then Why?
He(g) in a volume of 1 L or He(g) in a volume of 5 L both at 25°C.
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.
What is a spontaneous process? What are its characteristics?
Calculate ΔG for ΔH = − 110 kJ, ΔS = + 40 J K−1 at 400 K.
For a certain reaction ΔH0 is −224 kJ and ΔS0 is −153 J K−1. At what temperature the change over from spontaneous to non-spontaneous will occur?
Which of the following is true about the decomposition of ozone?
