Thermodynamics ...

for a forward reaction in the process A + B ⇌ C is -ve.

What is the sign of in case of a backward reaction?

For the reaction
(g) (g)
The signs of and are

For the reaction

C₃H₈ (g) + 5O₂ (g) 3CO₂ (g) + 4H₂O ()

At constant temperature, – is

The of CH₄ is –74.8 kJ/mol. The additional information required for determining the average C – H bond energy is

If 1 mole of NH₃ and 1 mole of are mixed in a closed container to form (g), which of the following is correct?

The amount of heat evolved when 500 cm³ of 0.1 M HCl is mixed with 200 ml of 0.2 M NaOH is

If = 30 kJ/mol and = 75 J/K mol, then the temperature of vapours at 1 atm pressure is

A reversible chemical reaction (g) ⇌ 2NO (g) + (g) is carried at 400 K with
= 77.2 kJ/mol
= 122 J/K/mol

Which of the following is the correct value (x) for of the reaction?

A reversible chemical reaction (g) ⇌ 2NO (g) + (g) is carried at 400 K with
= 77.2 kJ/mol
= 122 J/K/mol
Using the value of x (from the previous question 8), the correct value of k (equilibrium constant) of the reaction is

Thermochemical equation for the gaseous and solid rocket fuels are

H₂ (g) + O₂ (g) H₂O () = – 286 kJ
+ O₂ (s) = – 1667.8 kJ

If equal masses of H₂ and are taken, the better rocket fuel is

Thermochemical equations for the gaseous and solid rocket fuels are
H₂ (g) + O₂ (g) H₂O () = – 286 kJ
+ O₂ (s) = – 1667.8 kJ

For the reaction
O₃ (s) (g) + O₂ (g)
The value of is _______ kJ.

Thermochemical equations for the combustion of some important fuels are
H₂(g) + O₂ (g) H₂O () = – 286.0 kJ
C (g) + O₂ (g) CO₂ (g) = – 393.5 kJ
C₆H₆ () + O₂ (g) 6CO₂ + 3H₂O () = – 3267.6 kJ
C₂H₅OH + 3O₂ 2CO₂ + 3H₂O = – 1368.0 kJ

The amount of heat change, when 1 mole of C₂H₅OH is formed from its constituents, is

Thermochemical equations for the combustion of some important fuels are
H₂(g) + O₂ (g) H₂O () = – 286.0 kJ
C (g) + O₂ (g) CO₂ (g) = – 393.5 kJ
C₆H₆ () + O₂ (g) 6CO₂ + 3H₂O () = – 3267.6 kJ
C₂H₅OH + 3O₂ 2CO₂ + 3H₂O = – 1368.0 kJ

The standard enthalpy of formation of benzene is

There are two crystalline forms of lead oxide (PbO) which are known as red and yellow oxides. The for these two oxides is – 219.0 kJ and – 217.3 kJ, respectively.

What is the value of when yellow form of oxide undergoes solid-solid phase transition to form red oxide?

There are two crystalline forms of lead oxide (PbO), which are named as Red and Yellow oxides.
The for these two oxides are – 219.0 kJ and – 217.3 kJ, respectively.

The , when 2 moles of red oxide undergo solid-solid phase transition to form 2 moles of yellow oxide, is