Heat Capacity
Trending Questions
Q.
Molar heat capacity of water in equilibrium with Ice at constant pressure is
Zero
∞
40.45 KJ/K/Mol
75.48 KJ/K/Mol
Q. 2 moles of an ideal gas at temp 27 degree c is heated isoermall from volume v to 4v .if R=2 cal/mol then the heat input in the process is approximately
Q. 43.Explain: The average KE of an ideal gas in calories per mole is approximately equal to three times its absolute temperature.
Q.
In an irreversible process taking place at constant T and P and in which only PV work is being done, the change in free energy (dG) and change in entropy (dS) satisfy the criteria:
= 0 
= +ve 
= -ve 
= -ve
Q. 36. In an isobaric process of a diatomic gas 140J of heat is added to N moles of the gas to increase its temperature from T1 to T2.the amount of work done by the gas in this process is 1) 60J 2) 120J 3) 100J 4) 40J
Q. The standard heat of formation of CH4(g), CO2(g) and H2O(g) are -76.2, -398.8 and -241.6 kJ mol−1 respectively. Calculate the amount of heat evolved by burning 1m3 of methane measured under normal conditions.
35973.2 kJ
35972.2 kJ
-35973.2 kJ
35972.2 KJ
Q. Stearic acid [CH3(CH2)16CO2H] is a fatty acid. 1.0 g of stearic acid was burned in a bomb calorimetre. The bomb had a heat capacity of 652J/∘C. If the temperature of 500 g water (c=4.18J/g ∘C) rose from 25.0 to 39.3 ∘C, how much heat was released when the stearic acid was burned? [Given Cp(H2O)=4.18J/g ∘C]
- −39.21 kJ
- −29.91 kJ
- −108 kJ
- −9.32 kJ
Q. The increase in temperature is directly proportional to the quantity of heat (q) absorbed by the system.
True
False
Q. Assuming that water vapour is an ideal gas, the internal energy change when 1 mole of water is vaporised at 1 bar pressure and 100°C, (Given: molar enthalpy of vaporization of water at 1 bar and 373 kelvin = 41KJ mol^-1 and R= 8.3mole^-1K^-1) will be
Q. Why no matter exists at absolute zero temperature
Q. 7)48 20 The minimum heat energy required to cause complete dissociation of n moles of H. 5 temperature T is H gas at constant 5 6 (3) nRT (4) RT 2. 1) nRT
Q.
Express calorie in Joules.
Q. 7. One mole of an ideal monoatomic gas requires 210 J heat to raise the temp by 10 K, when heated at constant pressure.if the same gas is heated at constant volume to raise the temp by 10 K then heat required is
Q. One mole of ideal gas is allowed to expand reversibly and adiabatically from a temperature of 27∘C. If the work done by the gas in the process is 3kJ, the final temperature will be equal to: (CV=20J/Kmol)
Q. First three nearest neighbour distances for primitive cubic unit cell will be, respectively:
(Here, edge length of unit cell =l )
(Here, edge length of unit cell =l )
- √3 l, √2 l, l
- l, √2 l, l
- l, √2 l, 2 l
- l, √2 l, √3 l
Q. For a perfectly crystalline solid Cp.m=aT3, where a is constant. If Cp.m is 0.42 J/Kmol at 10 K, molar entropy at 10 K is :
- 0.42 J/Kmol
- 0.14 J/Kmol
- 4.2 J/Kmol
- zero
Q.
Standard entropy of X2, Y2 and XY3 are 60, 40 and 50 Jk−1mol−1, respectively.
For the reaction, 12X2 + 32Y2 → XY3, ΔH = −30 kJ, to be at equilibrium, the temperature wil be
1250 K
500 K
750 K
1000 K
Q. Two moles of an ideal monoatomic gas undergoes a cyclic process ABCA as shown in the V−T diagram above.
Then, which of the following statements is/are correct? [R is a gas constant]
Then, which of the following statements is/are correct? [R is a gas constant]
- Work done on the gas during the BC process is 600R
- Heat supplied to the gas during the BC process is 1500R
- Work done by the gas during the entire cycle is 600R(ln2−1)
- Heat supplied to the gas during the AB process is 600Rln2
Q. find eqv molar heat capacity for entie process ?
Q. Choose the correct answer form the alternatives given.
E∘ for Cl2/Cl−=+1.36, I2/I−=+0.53, Ag+/Ag=+0.79, Na+/Na=−2.71 and Li+/Li=−3.04V What is the order of decreasing reducing strength for these species?
E∘ for Cl2/Cl−=+1.36, I2/I−=+0.53, Ag+/Ag=+0.79, Na+/Na=−2.71 and Li+/Li=−3.04V What is the order of decreasing reducing strength for these species?
- Li>Cl−>Ag>I−>Na
- Li>Na>I−>Ag>Cl−
- Na>Li>Ag>Cl−>I−
- Cl−>Ag>I−>Na>Li
Q. a container is filled with 20 moles of an ideal diatomic gas at absolute temperature T.When heat is supplied to gas temperature remains cons†an t but 8 moles dissociate into atoms .Find the heat energy given to the gas
Q. The work done in adiabatic compression of 2 moles of an ideal monatomic gas by the constant external pressure of 2 atm starting from an initial pressure of 1 atm and an initial temperature of 300 K is:
[R = 2 cal/mol-K]
- 360 cal
- 720 cal
- 800 cal
- 1000 cal
Q. 10 moles of an ideal gas confined to a volume of 10 L is released into atmosphere at 300 K where the pressure is 1 bar. The work done by the gas is:(R=0.083 LbarK−1mol−1)
- 249 L.bar
- 259 L.bar
- 239 L.bar
- 220 L.bar
Q. {At constant temperature vapour density of N}}_2{O}}_{4 }{is found to be 30. Calculate percent dissociation of N}}_2{O}}_4
Q. Ten moles of a diatomic perfect gas are allowed to expand at constant pressure. The initial volume and temperature are V0 and T0 respectively. If 72RT0 heat is transferred to the gas then the final volume and temperature are
- 1.1V0, 1.1T0
- 1.1V0, 1011T0
- 0.9V0, 0.9T0
- 0.9V0, 109T0
Q. The change in vapourisation of liquid at 500k and 1 atm. what will be the change in internal energy of 3 moles of liquid at same temperature?
Q.
Define calorie?
Q.
The net work done through a series of changes reported in the figure at the end of the cycle for an ideal gas is equal to:
- 0
- −2PV
- −3PV
- −5PV
Q. A gas expands from a volume of 3.0 dm3 to 5.0 dm3 against a constant pressure of 3.0 atm the work done during expansion is used to heat 10.0 mole of water of temperature 290.0 K Calculate the final temperature of water (specific heat of water =4.184 JK−1g−1)
- 290 K
- 289.2 K
- 290.8 K
- 291.8 K
Q. the specific heat of a gas is found to be 0.075 calories at constant volume and its formula wt is 40 .the atomicity of the gas would be
1)one
2)two
3)three
4)four
