Two ideal gases under same pressure and temperature are allowed to mix in an isolated system. What will be the sign of entropy change?
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An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system.
(a) : If a gas was to expand by a certain volume reversibly, then it would do a certain amount of work on the surroundings. If it was to expand...
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Keeping the number of moles, volume and temperature the same, which of the following are the same for all ideal gases ?
The correct answer is (c) pressure
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Which of the following quantities is the same for all ideal gases at the same temperature ?
(a) the kinetic energy of 1mole
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Give relationship between entropy change and heat absorbed/evolved in a reversible reaction at temperature T.
∆S = q rev/T
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What is meant by entropy driven reaction? How can the reaction with positive change of enthalpy and entropy be made entropy driven?
The free energy change of a reaction is given by ΔG = ΔH – TΔS For a reaction to be spontaneous, ΔG should be –ve. If both ΔH and ΔS are positive...
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Calculate the entropy change in the surroundings when 1.00 mol of H2O (l) is formed under standard conditions: Δ fH0 = - 286 kj mol^-1.
H2 (g) + ½ O2 (g) ---> H2O (g), Δf H0 = -286kj mol-1 This means that when 1 mol of H2O (l), is formed , 286 kj of heat is...
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Predict the sign of entropy change in each of the following : (I) H2 (at 298 K, 1 atm) →H2 (at 298K, 10 atm)
Entropy is a measure of randomness or disorder of a system. If randomness increases entropy increases. (I) Gas at lower pressure has greater randomness thanΔ at high pressure (compressed gas) at...
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Politics and social divisions must not be allowed to mix. Substantiate this statement, with five arguments.
(i) Democracy involves competition among various political parties. Their competition tends to divide any society. If they start competing in terms of some existing social divisions, it can make social...
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Generally some teenagers readily come under bad influences under peer group pressure. (i) Why do teenagers readily come under this influence ?
(i) Adolescence brings about the hormonal secretion among teenagers. This leads to some physical and emotional changes among them which are difficult to handle by them. (ii) (a) Proper counselling of...
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The elements of marketing mix are popularly known as four points of marketing. Explain briefly these elements of marketing mix.
The four important elements of marketing mix are: (i) Product mix, (ii) Price mix, (iii) Place mix and (iv) Promotion mix. (i) Product Mix: Product mix is related to the...
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