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Published on: 28/08/2019
Thermodynamics
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Questions + Answers key
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1.
Define intensive properties.
2.
How is entropy of a substance related to temperature?
3.
If the combustion of 1g of graphite produces 20.4kJ of heat, what will be molar enthalpy change? Give the significance of sign also.
4.
Predict the change in internal energy for an isolated system at constant volume.
5.
In the equation, \({ N }_{ 2 }(g)+3{ H }_{ 2 }(g)\rightleftharpoons 2N{ H }_{ 3 }(g)\) what would be the sign of work done?
6.
An isochoric process takes place at constant ______.
temperature
pressure
volume
concentration
7.
Thermodynamics is applicable to ______.
macroscopic system only
microsopic system only
homogeneous system only
heterogeneous system only
8.
As per the available data: ______.
CH4(g) + 2O2(g) \(\rightarrow \) CO2(g) + 2H2O(l); \(\triangle \)C \(H^{ \ominus }\) = -890.3 KJ mol-1
C(s) + O2(g) \(\rightarrow \) CO2(g) \(\triangle \)C \(H^{ \ominus }\)=-393.5 KJ mol-1
H2(g) + 1/2O2(g) \(\rightarrow \) H2O (l); \(\triangle \)C\(H^{ \ominus }\)= -285.8 KJ mol-1
9.
For the process to occur under adiabatic conditions, the correct condition is:_______.
\(\triangle \)T = 0
\(\triangle \)P = 0
q = 0
w = 0
10.
Choose the correct answer. A thermodynamic state function is a quantity _______.
used to determine heat changes
whose value is independent of path
used to determine pressure volume work
whose value depends on temperature only.
1.
Properties which depend on the nature of the substance and not on the amount of the substance are called intensive properties.
2.
On increasing temperature, entropy of a substance increases.
3.
Molar enthalpy change for the combustion of graphite, △H = enthalpy of combustion of 1 g graphite molar mass
△H=−20.7kJg−1 × 12gmol−1
=−2.48×102kJmol−1
Negative sign in the value of △H indicates that the reaction is exothermic.
4.
For isolated system there is no transfer of energy as heat or work, so according to the first law of thermodynamics,
△U=q+W
△U=0+0=0
5.
The sign of work done will be positive, i.e. work will be done on the system due to a decrease in volume.
6.
(c)
volume
7.
(a)
macroscopic system only
8.
(a)
CH4(g) + 2O2(g) \(\rightarrow \) CO2(g) + 2H2O(l); \(\triangle \)C \(H^{ \ominus }\) = -890.3 KJ mol-1
9.
(c)
q = 0
10.
(b)
whose value is independent of path
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