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Recent questions tagged unit6
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The enthalpy of combustion of cyclohexane, cyclohexene and $H_2$ are respectively -3920, -3800 and -241 kJ/mol. The heat of hydrogenation of cyclohexane is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 28, 2014
by
mosymeow_1
1
answer
Given a mole of a non-ideal gas which undergoes a change of state (2.0 atm, 3.0 L 95 K) $\rightarrow$ (4.0 atm, 5.0 L, 245 K) with a change in internalenergy, $\Delta U$ = 30.0 L atm. What will be the change in enthalpy ($\Delta H$) of the process in L atm?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 28, 2014
by
mosymeow_1
1
answer
At $27^\circ C$ the enthalpy change for the transition of liquid water to steam is 30 kJ/mol. What would be the entropy change for the process?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 28, 2014
by
mosymeow_1
1
answer
Which of the following gas has the highest heat of combustion?
sat
chemistry
chemical-reactions-and-thermochemistry
jeemain
class11
unit6
chemical-thermodynamics
easy
asked
Feb 28, 2014
by
mosymeow_1
1
answer
In a flask colourless $N_2O_4$ is in equilibrium with brown coloured $NO_2$. At equilibrium when the flask is heated at $100^\circ C$, the brown colour deepens and on cooling it becomes less coloured. The changed in enthalpy, $\Delta H$ for this system is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 28, 2014
by
mosymeow_1
1
answer
For the decomposition of $Ag_2O$ at 298 K. $Ag_2O (s) \longrightarrow 2Ag(s) + \frac{1}{2} O_2(g) \Delta G^\circ$ = 11.21 kJ which of the following statement is true?
jeemain
chemistry
class11
unit6
thermodynamics
medium
asked
Feb 28, 2014
by
mosymeow_1
1
answer
If $\Delta H^\circ _f$ and $\Delta G ^\circ _f$ of $CH_3OH(g)$ at 298 K is -200.7 kJ/mol and -162 kJ/mol respectively, then absolute entropy of $CH_3OH(g)$ at 298 K is (given absolute entropies of C(s), $H_2(g)$ and $O_2(g)$ at 298 K are 5.7, 130.60 and 205.00 J/mol respectively).
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 28, 2014
by
mosymeow_1
1
answer
Devitrification of glass is a process for which change in entropy, $\Delta S$ is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 28, 2014
by
mosymeow_1
1
answer
Dissolution of gases in water is
sat
chemistry
chemical-reactions-and-thermochemistry
jeemain
class11
unit6
chemical-thermodynamics
medium
asked
Feb 28, 2014
by
mosymeow_1
2
answers
Two coins eash weighing 10 g are heated to 473 K and dropped into two identical vessels A and B, each containing 500 g of water at 298 K. The coin dropped in vessel A is made up of aluminium and the coin dropped into vessel B is amde up of silver. The rise in temperature of water in container
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 27, 2014
by
mosymeow_1
1
answer
At $298\; K, 0.1\; mol$ of methane is burnt in a bomb calorimeter such that $\Delta V=0$. The heat so produced is taken up by a large amount of water so that $\Delta T$ is very small.
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 27, 2014
by
mosymeow_1
1
answer
A $1.0\; g$ sample of substance A at $100^\circ C$ is added to $100\; mL$ of $H_2O$ at $25^\circ C$. Using separate $100\; mL$ portions of $H_2O$, the procedure is repeated with substance $B$ and then with substance $C$. How will the final temperatures of the water compare?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 27, 2014
by
mosymeow_1
1
answer
The amount of heat evloved when 500 $cm^3$ 0.1 M HCl is mixed with 200 $cm^3$ of 0.2 M NaOH is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 27, 2014
by
mosymeow_1
1
answer
$H_2O(g) + C(s) \rightarrow CO(g) + H_2(g)$ ; $\Delta H = 131$ kJ. $CO(g) + \frac{1}{2} O_2(g) \rightarrow CO_2(g)$ ; $\Delta H = -282$ kJ. $H_2(g) + \frac{1}{2} O_2(g) \rightarrow H_2O(g)$ ; $\Delta H = -242$ kJ. $C(s) + O_2(g) \rightarrow CO_2(g)$ ; $\Delta H = X $ kJ. Based on the above thermochemical equations find the value of X.
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 27, 2014
by
mosymeow_1
1
answer
10 moles of an ideal gas expands into vacuum. The work done is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 27, 2014
by
mosymeow_1
2
answers
The source of energy in a cellular reaction is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 27, 2014
by
mosymeow_1
2
answers
The heat liberated when $1.89\; g$ of benzoic acid is burnt in a bomb calorimeter at $25^\circ C$ increases the temperature of $18.94\; kg$ of water by $0.632^\circ C$. If the specific heat of water at $25^\circ C$ is $0.998 \;cal/g$ deg, the value of the heat of combustion of benzoic acid is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 27, 2014
by
mosymeow_1
1
answer
What is the P-P bond energy in kJ/mol, if the heat of atomisation of $PH_3(g)$ and $P_2H_4(g)$ are 954 kJ/mol and 1485 kJ/mol, respectively?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 27, 2014
by
mosymeow_1
1
answer
Let the activation energies of two reactions be $E_1$ and $E_2$ where $E_1>E_2$. If temperature of the system is increased from $T_1$ to $T_2$, the rate constant of the reactions changes from $k_1$ to $k_1'$ in the first reaction and from $k_2$ to $k_2'$ in the second reaction. Which of the following expression is correct?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 27, 2014
by
mosymeow_1
1
answer
Which one of the following equation is true? (Given, $\delta E = T\delta S -P\delta V$ and $H=E+PV$)
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 27, 2014
by
mosymeow_1
1
answer
The reaction $A \leftrightharpoons B$; $\Delta H = +24\; kJ/mol$. For the reaction $B\leftrightharpoons C$; $\Delta H=-18$ kJ/mol. The decreasing order of enthalpy of $A, B$ and $C$ follow the order
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 27, 2014
by
mosymeow_1
1
answer
The enthalpy of neutralisation of oxalic acid by strong base is 25.4 kcal/mol. The enthalpy of neutralisation of strong acid and strong base is -13.7 kcal/equil. The enthalpy of dissociation of $H_2C_2O_4 \leftrightharpoons 2H^+ + C_2O_4^{2-}$ is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 27, 2014
by
mosymeow_1
1
answer
Cooking is fast in a pressure cooker because
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 27, 2014
by
mosymeow_1
2
answers
To raise the temperature of 4.48 litres of an ideal gas at STP by $15^\circ C$ it requires 12.0 calories. The $C_P$ of the gas is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 27, 2014
by
mosymeow_1
1
answer
How many calories are required to heat 40 grams of argon from $40-100^\circ C$ at constant volume? (R = 2 cal/mol K)
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 27, 2014
by
mosymeow_1
1
answer
$\Delta G^\circ$ for a reaction is 46.06 kcal/mol, $K_P$ for the reaction at 300 K is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 27, 2014
by
mosymeow_1
1
answer
Enthalpy =
sat
chemistry
chemical-reactions-and-thermochemistry
jeemain
class11
unit6
chemical-thermodynamics
medium
asked
Feb 27, 2014
by
mosymeow_1
2
answers
Given, the enthalpy of combustion of glucose is 3000 kJ/mol. How much of glucose one has to consume to walk a distance of 5 km, provided 150 kJ of energy is needed for muscular work to walk a distance of 1 km and only 30 % energy is available for muscular work?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 27, 2014
by
mosymeow_1
1
answer
When 0.1 mole of a gas absorbs 41.75 J of heat, the rise in temperature occurs equal to $20 ^\circ C$. The gas must be
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 27, 2014
by
mosymeow_1
1
answer
Enthalpy of formation of (C=C) and (C-C) in $C_2H_4$ is -590 kJ/mol and -331 kJ/mol, respectively. What is the enthalpy change when ethylene polymerises to form polythene?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 27, 2014
by
mosymeow_1
1
answer
At 273 K the enthalpy of a certain reaction is -20.75 kJ. If heat capacities of the reactants and products are the same, then what will be the enthalpy of the same reaction at 373 K?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 27, 2014
by
mosymeow_1
1
answer
$CO(g) + \frac{1}{2} O _2 \longrightarrow CO_2$, $\Delta H$ and $\Delta S$ for the reaction are $-283\; KJ$ and $-87\; JK^{-1}$. It was intended to carry out this reaction at $1000, 1500, 3000$ and $3500\; K$. At which of these temperatures would this reaction be thermodynamically spontaneous?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 27, 2014
by
mosymeow_1
1
answer
Some equations are given below. Which of the following processes does not correctly represent the first law of thermodynamics ?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 27, 2014
by
mosymeow_1
1
answer
To 100 $cm^3$ water at 298 K, 0.06 mole of $KNO_3$ is added. The enthalpy of $KNO_3$(aq) solution is 35.8 kJ $mol^{-1}$. What will be the temperature of the solution, after the solute is dissolved?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 27, 2014
by
mosymeow_1
1
answer
Study the given diagram. 3 moles of gas is put through a series of thermodynamic changes as shown graphically in a cyclic process. The processes A $\rightarrow$ B, B $\rightarrow$ C and C $\rightarrow$ A respectively are
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 27, 2014
by
mosymeow_1
1
answer
Heat of neutralisation of HCl with $NH_4OH$ and NaOH with $CH_3COOH$ are respectively -51.4 and -50.6 kJ $eq^{-1}$. What will be the heat of neutralisation of acetic acid with $NH_4OH$?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 26, 2014
by
mosymeow_1
1
answer
If the heat of neutralisation for a strong acid-base reaction is -57.1 kJ what would be the heat released when 350 $cm^3$ of 0.20 M $H_2SO_4$ is mixed with 650 $cm^3$ of $0.10\; M\; NaOH$ ?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 26, 2014
by
mosymeow_1
1
answer
If the bond dissociation energies of the diatomic molecules $XY, X_2$ and $Y_2$ are in the ratio of 1 : 1 : 0.5 and $\Delta_fH$ for the formation of XY is -200 kJ $mol^{-1}$. What is the bond dissociation energy of $X_2$ will be
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 26, 2014
by
mosymeow_1
1
answer
$N_2 + 3H_2 \longrightarrow 2NH_3$ This reaction is carried out at constant temperature and pressure. If $\Delta H$ and $\Delta U$ are enthalpy and internal energy change for the reaction, which of the following expression is true?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 26, 2014
by
mosymeow_1
1
answer
For a spontaneous reaction, the $\Delta G$, equilibrium constant, K and $E^\circ _{cell}$ will be respectively
sat
chemistry
chemical-reactions-and-thermochemistry
jeemain
class11
unit6
chemical-thermodynamics
easy
asked
Feb 26, 2014
by
mosymeow_1
1
answer
$MgO(s) + 2HCl(aq) \longrightarrow MgCl_2(aq) + H_2O(l)$; The absolute enthalpy of neutralisation of the reaction is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 26, 2014
by
mosymeow_1
1
answer
How much heat would release when an aqueous solution containing 0.5 mol of $HNO_3$ is mixed with 0.3 mol of $OH^{-1}$? Given, enthalpy of neutralisation is -57.1 kJ.
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 26, 2014
by
mosymeow_1
1
answer
At 1 atm pressure, for a reaction $\Delta H = + 30.558$ kJ $mol^{-1}$ and $\Delta S = 0.066$ kJ $mol^{-1}$. The temperature at which free energy is equal to zero and the nature of the reaction below this temperature are
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 26, 2014
by
mosymeow_1
1
answer
Study the following table and, on the basis of these values of $\Delta H$ and $\Delta S$ for five different reactions, predict which one of these will be spontaneous at all temperatures?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 26, 2014
by
mosymeow_1
1
answer
A cylinder of gas is assumed to contain 14 kg of butane. A normal family requires 20,000 kJ of energy per day for cooking. How many days will the butane gas in the cylinder last?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 26, 2014
by
mosymeow_1
1
answer
What is the change in entropy of 1 mole of a perfect gas, which expands isothermally to ten times its original volume?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 26, 2014
by
mosymeow_1
1
answer
The heat liberated when 50 $cm^3$ of 0.2 N $H_2SO_4$ is mixed with 50 $cm^3$ of 1 N KOH, is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 25, 2014
by
mosymeow_1
1
answer
Show the relation between the enthalpies of the reactions: $H_2(g)+ \frac{1}{2} O_2(g) \rightarrow H_2O(g); \Delta H_1$ and $H_2(g)+\frac{1}{2}O_2(g) \rightarrow H_2O(l); \Delta H_2$
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 25, 2014
by
mosymeow_1
1
answer
What is the standard Gibbs energy change for the reaction at 298 K, if standard enthalpy and standard entropy changes for the oxidation of ammonia at 298 K are 382.64 kJ $mol^{-1}$ and -145.6 $JK^{-1}mol^{-1}$, respectively.
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 25, 2014
by
mosymeow_1
1
answer
How much heat is liberated when 100 mL of 1 N NaOH is neutralised by 300 mL of 1 N HCl ?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 25, 2014
by
mosymeow_1
1
answer
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