Calculate thange in enthalpy for a given reaction,
2H2O2(l) 2H2O(l) + O2(g)
(Given the heat of formation of H2O2(l) and H2O(l) are -188 and -286 kJ/mol
respectively)
1. -196 kJ/mol
2. + 196 kJ/mol
3. +948 kJ/mol
4. -948 kJ/mol
Enthalpy of the reaction,
CH4(g) + 1/2O2(g) CH3OH(l), is negative. If the enthalpy of combustion of CH4 and CH3OH are x and y respectively, then
which relation is correct?
1. x>y
2. x<y
3. x=y
4. xy
If 50 calorie are added to a system and system does work of 30 calorie on surroundings, the change in internal energy of system is:
1. 20 cal
2. 50 cal
3. 40 cal
4. 30 cal
Which statements are correct?
1. is called Clausius-Clapeyron equation
2. is called Trouton's rule
3. Entropy is a measure of unavailable energy, i.e.,
unavailable energy = entropy x temperature
4. All of the above
The reaction CH4(g) + Cl2(g)CH3Cl(g) + HCl(g)
has =-25 Kcal
Bond | Bond Energy Kcal |
EC-Cl | 84 |
EH-Cl | 103 |
EC-H | X |
ECl-Cl | Y |
X:Y | 9:5 |
From the given data, what is the bond enthalpy of Cl-Cl bond?
1. 70 Kcal
2. 80 Kcal
3. 67.75 Kcal
4. 57.85 Kcal
Consider the reaction
N2(g) + 3H2(g)2NH3(g) carried out at constant temperature and pressure. If H and E are enthalpy change and internal energy change respectively, which of the following expression is True?
In the reaction at 300 K
H2(g) + Cl2(g)2HCl(g) = -185 kJ
if 2 mol of H2 completely react with 2 mole of Cl2 to form HCl. What is for this reaction?
(1) 0
(2) -185 kJ
(3) -370 kJ
(4) None of these
What will be the standard enthalpy of reaction for the following reaction using the listed enthalpies of reaction:-
3Co(s) + 2O2(g)Co3O4(s); =?
2Co(s) + O2(g) 2CoO(s) = -475.8 KJ
6CoO(s) + O2(g) 2Co3O4(s) = -355.0 KJ
(1) -891.2 KJ
(2) -120.8 KJ
(3) 891.2 KJ
(4) -830.8 KJ
For given following equations and 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) = -537 kJ
C(s) + 2F2(g) CF4(g) =-680 kJ
2C(s) + 2H2(g) C2H4(g) = 52 kJ
1. -1165
2. -2486
3. +1165
4. +2486
If the bond energies of H-H, Br-Br, and H-Br are 433, 192 and 364 kJ mol-1 respectively,
the for the reaction
H2(g) + Br2(g) 2HBr(g) is
1. -103 kJ
2. -261 kJ
3. +103 kJ
4. +261 kJ