U° for combustion of methane is -x kJ mol-1.

The value of H° for the same reaction would be -

1. = U°2. > U°3. < U°4. =0

Subtopic:  Enthalpy & Internal energy |
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701 J of heat is absorbed by a system and 394 J of work is done by the system.

The change in internal energy for the process is-

1. 307 J2. -307 J3. 1095 J4. -701 J

Subtopic:  First Law of Thermodynamics |
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The reaction of cyanamide, NH2CN (s) with dioxygen, was carried out in a bomb calorimeter, and ∆U was found to be -742.7 kJ mol-1 at 298 K.

NH2CN (s) + 32O2(g)  N2 (g) + CO2(g) + H2O (l)

The enthalpy change for the reaction at 298 K would be -

1. -741.3 kJ mol-12. + 753.9 kJ mol-13. + 772. 7 kJ mol-14. -845. 1 kJ mol-1

Subtopic:  Enthalpy & Internal energy |
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The amount of heat needed to raise the temperature of 60.0 g of aluminum from 35°C to 55°C would be -

(Molar heat capacity of Al is 24 J mol-1 K-1)

1. 1.07 J2. 1.07 kJ3. 106.7 kJ4. 100.7 kJ

Subtopic:  Thermodynamics' Properties and process |
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The enthalpy of formation of COg, CO2g, N2Og , and N2O4g are

–110 kJ mol-1, – 393 kJ mol-1, 81 kJ mol-1, and 9.7 kJ mol-1 respectively.

The value of rH for the reaction would be-

N2O4g+3COgN2Og+3CO2g

1. -777.7 kJ mol-12.  +777.7 kJ mol-13.  +824.9 kJ mol-14. - 345.4 kJ mol-1

Subtopic:  Thermochemistry |
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 N2 + 3 H2  2NH3 ; rH° = -92.4 kJ mol-1

The standard enthalpy of formation of NH3 gas in the above reaction would be-

1. -92.4  J mol-12.  -46.2 kJ mol-13.  + 46.2 J mol-14. + 92.4 kJ mol-1

Subtopic:  Thermochemistry |
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The standard enthalpy of formation of CH3OH(l) from the following data is -

CH3OHl+ 32O2g  CO2g + 2H2Ol; rH° = -726 kJ mol-1C(s) + O2g  CO2g ; cH° = -393 kJ mol-1H2g + 12O2g  H2Ol ; fH° = -286 kJ mol-1

1. -239 kJ mol-12. + 239 kJ mol-13. -47 kJ mol-14. +47 kJ mol-1

Subtopic:  Thermochemistry |
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vapH° (CCl4) = 30.5 kJ mol-1fH° (CCl4) = - 135.5 kJ mol-1aH° (C) = 715.0 kJ mol-1aH° (Cl2)= 242 kJ mol-1

The enthalpy change for the reaction

 CCl4 (g)  C(g) + 4Cl (g) would be -

1. 326 kJ mol-12. 1304 kJ mol-13. -328 kJ mol-14. -1304 kJ mol-1

Subtopic:  Thermochemistry |
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For an isolated system with ∆U = 0, the ∆S value will be-

1. Positive

2. Negative

3. Zero

4. Not possible to define

Subtopic:  Classification of System, Extensive & Intensive Properties |
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For the reaction at 298 K,

2A + B → C

H = 400 kJ mol-1 and S = 0.2 kJ K-1 mol-1 .Reaction will become spontaneous at-

1. 1500 K2. 2000 K3. 100 K4. 1900K

Subtopic:  Spontaneity & Entropy |
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