Email

Chat with tutors

Login

Ask Questions, Get Answers

Menu X

home ask tuition questions practice papers mobile tutors pricing

X

Recent questions tagged thermodynamics

Normal body temperature is $\;98.4^{0}F\;.\;$ What is the corresponding reading on the celsius scale ?

asked Mar 21, 2014 by yamini.v

1 answer

The work done in process ABC (in atm litre)

asked Mar 21, 2014 by yamini.v

1 answer

A gas is expanded from volume $\;V_{0}\;$ to $\;2V_{0}\;$ under three different processes . Process 1 is isobaric , process 2 is isothermal and process 3 is adiabatic . Let $\;\bigtriangleup u_{1}\;, \bigtriangleup u_{2}\;$ and $\;\bigtriangleup u_{3}\;$ be the change in internal energy of the gas in the three processes . Then :

asked Mar 21, 2014 by yamini.v

1 answer

Work done by gas in cyclic process ABCDA .

asked Mar 21, 2014 by yamini.v

1 answer

During an adiabatic process , the pressure of a gas is formed to be proportional to the cube of its absolute temperature the value of r for the gas is

asked Mar 21, 2014 by yamini.v

1 answer

A diamotic gas is heated at constant pressure such that it performs 4 J of work . Find the heat supplied to the gas

asked Mar 21, 2014 by yamini.v

1 answer

P - T graph of an ideal gas is shown . Density of the gas at A is ' d ' and then density of the gas at B is

asked Mar 21, 2014 by yamini.v

1 answer

In a thermodynamic process 400 J of heat is given to a gas and 100 J of work is also done on set . Calculate the change in internal energy of the gas .

asked Mar 21, 2014 by yamini.v

1 answer

The ratio of molar heat capacities in path 1 and path 2

asked Mar 21, 2014 by yamini.v

1 answer

The internal energy of a system remains constant when it undergoes

asked Mar 21, 2014 by yamini.v

1 answer

In P - V graph

asked Mar 21, 2014 by yamini.v

1 answer

The work done in cyclic process is

asked Mar 21, 2014 by yamini.v

1 answer

In the following diagram , the net amount of work done will be

asked Mar 21, 2014 by yamini.v

1 answer

In the following two isothermals shown at temperatures $\;T_{1}\;$ and $\;T_{2}\;$ . Which of the following relations is correct ?

asked Mar 21, 2014 by yamini.v

1 answer

A gas is taken along a cyclic path as shown ABCDA in P - V diagram in two ways the change in internal energy is

asked Mar 21, 2014 by yamini.v

1 answer

S1: Heat absorbed during isothermal expansion of ideal gas in vacuum is zero. \[\] S2: Volume occupied by molecules of ideal gas is zero.

asked Mar 20, 2014 by thanvigandhi_1

1 answer

S1: $ \Delta G$ and $ \Delta H$ of a reaction always have the same sign. \[\] S2: $ \Delta G_f^{\circ}$ of carbon(graphite) is equal to zero.

asked Mar 20, 2014 by thanvigandhi_1

1 answer

. S1: $ \Delta H$ of a reaction is independent of temperature. \[\] S2: $\Delta H^{\circ}$ of a reaction = $ \sum H^{\circ}$(Products) - $ \sum H^{\circ}$(Reactants)

asked Mar 20, 2014 by thanvigandhi_1

1 answer

A system is taken from state A to state B through three different paths 1 , 2, 3 . The work done is minimum in

asked Mar 20, 2014 by yamini.v

1 answer

S1: Absolute values of H and E cannot be determined.\[\] S2: Both H and E are state functions.

asked Mar 20, 2014 by thanvigandhi_1

1 answer

S1: For the process to be spontaneous, both $ \Delta G$ as well as $ \Delta S$ has to be less than zero.\[\] S2: For spontaneous change, $ \Delta S_{Total} > 0.$

asked Mar 20, 2014 by thanvigandhi_1

1 answer

In an isochoric process $\;dQ : du\;$ =

asked Mar 20, 2014 by yamini.v

1 answer

S1: No heat engine has efficiency of 100% \[\] S2: Complete conversion of heat in to work is not possible.

asked Mar 20, 2014 by thanvigandhi_1

1 answer

S1: Reversible process and cyclic process have same meaning. \[\] S2: $\Delta H_{cycle}$ and $\Delta E_{cycle}$ is zero.

asked Mar 20, 2014 by thanvigandhi_1

1 answer

Which among the following is/are endothermic reaction(s)? \[\] (1) Combustion of methane \[\] (2) Decomposition of water \[\] (3) Dehydrogenation of ethane to ethane \[\] (4) Conversion of graphite to diamond

asked Mar 20, 2014 by thanvigandhi_1

1 answer

Two moles of a perfect gas undergoes following processes: \[\] 1. A reversible isobaric expansion from (1 atm, 20L) to (1 atm, 40L)\[\] 2. A reversible isochoric change of state from (1 atm, 40L) to (0.5 atm, 40L)\[\] 3. A reversible isothermal compression from (0.5 atm, 40L) to (1atm, 20L)\[\] Calculate the total work done involved in the above processes

asked Mar 20, 2014 by thanvigandhi_1

1 answer

1-pentyne(A) is treated with $4N$ alcoholic $KOH$ at $175^{\circ}C$. It is converted slowly into an equilibrium mixture of $1.3 \% \: 1-$ pentyne, $95.2 \%\: 2$-pentyne(B) and $3.5 \%$ of $1,2-$ pentadiene(C). The equilibrium was maintained at $175^{\circ}C. $ \[\] Calculate $ \Delta G^{\circ}$ for the equilibrium \[\] $B \leftrightharpoons C$

asked Mar 20, 2014 by thanvigandhi_1

1 answer

1-pentyne(A) is treated with $4N$ alcoholic $ KOH$ at $175^{\circ}C$. It is converted slowly into an equilibrium mixture of $1.3 \% \: 1-$ pentyne, $95.2 \%\: 2- $ pentyne(B) and $3.5 \%$ of $1,2- $ pentadiene(C). The equilibrium was maintained at $175^{\circ}C$. \[\] Calculate $ \Delta G^{\circ}$ for the equilibrium \[\] $ B \leftrightharpoons A$

asked Mar 20, 2014 by thanvigandhi_1

1 answer

A sample of Ar gas at 1 atm pressure and $27^{\circ}C$ expands reversibly and adiabatically from $1.25\: dm^3\: to\: 2.5\: dm^3$. Calculate enthalpy change of this process. $CV$ for argon is $ 12.4\: kJ/mol$

asked Mar 20, 2014 by thanvigandhi_1

1 answer

A monatomic ideal gas at temperature $ T_1$ is enclosed in a cylinder with frictionless piston. The gas is allowed to expand adiabatically to a temperature $T_2$ by releasing piston suddenly. If $L_1$ and $L_2$ are lengths of gas columns before and after expansion, then

asked Mar 20, 2014 by thanvigandhi_1

1 answer

Find the value of logKP for the reaction \[\] $N_2(g) + 3H_2(g) \leftrightharpoons 2NH_3(g) $ \[\] The standard enthalpy of formation of $ NH_3 \: is \: -46\: kJ$. The standard entropies of $N_2(g),\: H_2(g)\: and\: NH_3(g) \: are\: 191, 130\: and\: 192\: J/Kmol$ respectively. $(R = 8.3 \: J/Kmol)$

asked Mar 20, 2014 by thanvigandhi_1

1 answer

From the given data, calculate the enthalpy of combustion of cyclopropane at $298 \: K$. The enthalpy of formation of $CO_2(g), H_2O(l)$ and propene(g) are $-393.5, -285.8$ and $20.42 \: kJ/mol$ respectively. The enthalpy of isomerisation of cyclopropane to propene is $-33 \: kJ/mol$

asked Mar 20, 2014 by thanvigandhi_1

1 answer

The value of $ \Delta E$ for reversible isothermal evaporation of $90g$ of water at $100^{\circ}C$. Assume that water vapor behaves as ideal gas and $ \Delta H_{vap}$ of water is $540\: cal/g(R = 2\: cal/molK)$

asked Mar 20, 2014 by thanvigandhi_1

1 answer

The change in internal energy of a gas $\;du=$

asked Mar 20, 2014 by yamini.v

1 answer

Some amount of heat given to a gas under isothermal conditions will result in

asked Mar 20, 2014 by yamini.v

1 answer

If $\;du_{1}\;,du_{2}\;,du_{3}\;$ are change in internal energy of gas in isobaric , isothermal and adiabatic processes , then for the same change in temperature

asked Mar 20, 2014 by yamini.v

1 answer

$PV=nRT\;$ is true for

asked Mar 20, 2014 by yamini.v

1 answer

$dQ=du\;$ and $\;dw=0\;$ is

asked Mar 20, 2014 by yamini.v

1 answer

Increase in internal energy of a gas corresponds to

asked Mar 20, 2014 by yamini.v

1 answer

Heat supplied to a gas at constant pressure is utilised to

asked Mar 20, 2014 by yamini.v

1 answer

The amount of heat required to raise the temperature of a gas would be minimum when it is heated through

asked Mar 20, 2014 by yamini.v

1 answer

Compute the heat of formation of liquid methanol in kilojoules per mole, using the given data: \[\] $ \Delta H_{vap}$ of liquid methanol $= -38\: kJ/mol, \Delta H_f^{\circ}\: of\: H(g), C(g), O(g)$ respectively are $218, 715\: and\: 247\: kJ/mol$. Also, $ \Delta H_{C-H}, \Delta H_{C-O}, \Delta H_{O-H}$ being $415, 356, 463 \: kJ/mol$ respectively.

asked Mar 19, 2014 by thanvigandhi_1

1 answer

Enthalpy change involved in the oxidation of glucose is $-2880\: kJ/mol$. Twenty five percent of this energy is available for muscular work. If $100\: kJ$ of muscular work is required to walk one kilometer, what is the maximum distance that a person will be able to walk after eating $120g$ of glucose.

asked Mar 19, 2014 by thanvigandhi_1

1 answer

At $300\: K$, the standard enthalpies of formation of $C_6H_5COOH(s), CO_2(g)\: and\: H_2O(l)\: are\: -408, -393\: and\: -286 \: kJ/mol$ respectively. Calculate the heat of combustion of benzoic acid at constant volume and at constant pressure. $(R=8.31\: J/Kmol)$

asked Mar 19, 2014 by thanvigandhi_1

1 answer

A gas expands from a volume of $3\: dm^3$ against a constant external pressure of $3\: atm$. to a volume of $5\: dm^3$. The work of expansion is used to heat $ 10\: ml$ of water at $290\: K$. Calculate the final temperature of the water.

asked Mar 19, 2014 by thanvigandhi_1

1 answer

Water gas is fuel made by passing steam over red hot coke as $ H_2O(g) + C(s) \rightarrow CO(g)+H_2(g)$ \[\] Given that $ \Delta H_f^{\circ} \: of\: H_2O(g), CO(g)\: are\: -241.8\: and \: -110.5\: kJ/mol$. Also, the values of $S^{\circ}$ for $H_2O(g), C(s), CO(g)\: and\: H_2(g)\: are\: 188.7, 197.9, 131\: and\: 5.69\: J/Kmol$ respectively. Assuming $ \Delta H^{\circ}\: and\: \Delta S^{\circ}$ to be temperature independent, the temperature at which the reaction becomes favorable is

asked Mar 19, 2014 by thanvigandhi_1

1 answer

If the values of $ \Delta H_f^{\circ}\: for\: CH_4(g), C_2H_6(g), CO_2(g)\: and \: H_2O(l)$ are respectively $-74.85, -84.68, -393.5 \: and\: -286\: kJ/mol,$ predict which is more efficient fuel?

asked Mar 19, 2014 by thanvigandhi_1

1 answer

Calculate the resonance energy of $N_2O$ from the following data: \[\]$ \Delta H_f^{\circ}$ of $N_2O = 82 \: kJ/mol$, Bond energies of $N≡N,\: N=N,\: O=O \: and\: N=O$ bonds are $946,\: 418,\: 498\: and\: 607\: kJ/mol$ respectively

asked Mar 19, 2014 by thanvigandhi_1

1 answer

Calculate $ \Delta H_{C-H}$ from the following data: $ \Delta H^{\circ}_{combustion}$ of ethane and propane are $-372$ and $-530\: kcal/mol$ respectively, $ \Delta H_f^{\circ}$ of $CO_2(g)$ and $H_2O(l)$ are $-94$ and $-68\: kcal/mol,\: \Delta H^{\circ}$ for $C(graphite) \rightarrow C(g)\: is\: 172\: kcal \: and\: \Delta H_{H-H} \: is\: 104 \: kcal.$

asked Mar 19, 2014 by thanvigandhi_1

1 answer

Estimate the value of $ \Delta S^{\circ}_{298}$ for the dissociation of calcium carbonate given that, $ \Delta H^{\circ}_{298}$ for the reaction is $178\: kJ$. The equilibrium pressure is one bar at $897^{\circ}C.(R = 8.314\: J/Kmol)$

asked Mar 19, 2014 by thanvigandhi_1

1 answer

Page:

« prev
1
2
3
4
5
next »

Feedback Terms Facebook Twitter About Us

Your payment for is successful.

...