For given following equations and H° values determine the enthalpy of reaction at 298 K for the reaction 

C2H4(g) + 6F2(g)  2CF4(g) + 4HF(g)

H2(g) + F2(g)  2HF(g)       H1°= -537 kJ

C(s) + 2F2(g) CF4(g)         H2°=-680 kJ

2C(s) + 2H2(g) C2H4(g)    H3°= 52 kJ

(1) -1165 

(2) -2486

(3) +1165

(4) +2486

Concept Questions :-

Enthalpy and It's Type
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If Hf°(C2H4) and Hf°(C2H6) are x1 and x2 kcal/mol then heat of hydrogenation of C2H4 is :-

(1) x1 + x2

(2) x1 - x2

(3) x2 - x1

(4) x1 + 2x2

Concept Questions :-

Thermochemistry
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For oxidation of iron, 4Fe(s) + 3O2(g) 2Fe2O3(s), Hr°=-1648x103 J mol-1 entropy change is:

-549.4 J k-1mol-1 at 298 K:-

The reaction is

(1) Spontaneous

(2) Non spontaneous

(3) At Equilibrium

(4) Can't predict

Concept Questions :-

Spontaneity and Entropy
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18 g of ice is converted into water at 0°C and 1 atm. The entropy of H2O(s) and H2O(l) are 38.2 and 60 J K-1 mol-1 respectively. the enthalpy for this conversion will be

(1) 5951.4 J/mol

(2) 595.14 J/mol

(3) -595.14 J/mol

(4) None of these

Concept Questions :-

Gibbs Energy Change
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One mole of methanol when burnt in O2 gives out 723 kJ mol-1 heat. If one mole of O2 is used, what will be the amount of heat evolved?

1. 482 kJ               2. 241 kJ

3. 723 kJ               4. 924 kJ

Concept Questions :-

Thermochemistry
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If the bond energies of H-H, Br-Br, and H-Br are 433, 192 and 364 kJ mol-1 respectively,

the H° for the reaction

H2(g) + Br2(g) 2HBr(g) is

1.  -103 kJ               2. -261 kJ

3. +103 kJ               4. +261 kJ

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What will be the standard enthalpy of reaction for the following reaction using the listed enthalpies of reaction:-

3Co(s) + 2O2(g)Co3O4(s);       H=?

2Co(s) + O2(g) 2CoO(s)          H1= -475.8 KJ

6CoO(s) + O2(g) 2Co3O4(s)     H2 = -355.0 KJ

(1) -891.2 KJ

(2) -120.8 KJ

(3) 891.2 KJ

(4) -830.8 KJ

Concept Questions :-

Enthalpy and It's Type
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At 25°C, for the process H2O(l)H2O(g);

G° is 8.6 kJ. The vapour pressure of water at this temperature is nearly:-

(1) 24 torr

(2) 285 torr

(3) 32.17 torr

(4) 100 torr

Concept Questions :-

Spontaneity and Entropy
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For isothermal expanison in case of an ideal gas:-

(1) G=S

(2) G=H

(3) G=-TS

(4) None of these

Concept Questions :-

Spontaneity and Entropy
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The free energy change G=0 when:-

(1) the system is at equilibrium

(2) Catalyst is added

(3) Reactants are initially mixed throughly

(4)The reactants are completely consumed

Concept Questions :-

Spontaneity and Entropy
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Difficulty Level: