Thermodynamics
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Heat capacity (CP) is an extensive property but specific heat (c) is an intensive property. What will be the relation between Cp and c for 1 mol of water?
Heat capacity (CP) is an extensive property but specific heat (c) is an intensive property. What will be the relation between Cp and c for 1 mol of water?
This is a Short Answer Type Questions as classified in NCERT Exemplar
For water, molar heat capacity = 18 x Specific heat or Cp = 18 x c
But, specific heat,
C = 4.18 J g-1 K-1 Heat capacity,
Cp = 18 x 4.18 JK-1 = 75.24 JK-1
Upvote 
36. Out of diamond and graphite, which has greater entropy? At what temperature entropy of a substance is zero?
36. Out of diamond and graphite, which has greater entropy? At what temperature entropy of a substance is zero?
36. Graphite has greater entropy since it is loosely packed. At absolute zero the entropy of a substance is zero.
Upvote Expansion of a gas in vacuum is called free expansion. Calculate the work done and the change in internal energy when 1 litre of ideal gas expands isothermally into vacuum until its total volume is 5 litre?
Expansion of a gas in vacuum is called free expansion. Calculate the work done and the change in internal energy when 1 litre of ideal gas expands isothermally into vacuum until its total volume is 5 litre?
This is a Short Answer Type Questions as classified in NCERT Exemplar
During free expansion, external pressure is zero, so Work done, w = -pextΔV
= -0(5 – 1) = 0
Since the gas is expanding isothermally, therefore, q = 0
ΔU = q + w =0+0=0
Upvote 35. What is the enthalpy of formation of the most stable form of an element in its standard state?
35. What is the enthalpy of formation of the most stable form of an element in its standard state?
34. When is bond energy equal to bond dissociation energy?
34. When is bond energy equal to bond dissociation energy?
34. For diatomic molecules e.g. H2, O2, Cl2 etc. both energies are equal.
Upvote 33. Which one is the correct unit for entropy?
(a) KJ mol
(b) JK mol
(c) JK mol-1
(d) KJ mol-1
33. Which one is the correct unit for entropy?
(a) KJ mol
(b) JK mol
(c) JK mol-1
(d) KJ mol-1
3. The enthalpies of all elements in their standard states are:
(i) Unity
(ii) Zero
(iii) < 0
(iv) Different for each element
3. The enthalpies of all elements in their standard states are:
(i) Unity
(ii) Zero
(iii) < 0
(iv) Different for each element
2. For the process to occur under adiabatic conditions, the correct condition is:
(i) ?T= 0
(ii) ?p = 0
(iii) q = 0
(iv) w = 0
2. For the process to occur under adiabatic conditions, the correct condition is:
(i) ?T= 0
(ii) ?p = 0
(iii) q = 0
(iv) w = 0