Estimate the enthalpy change for the reaction:

$straight H subscript 2 left parenthesis straight g right parenthesis space plus space Br subscript 2 left parenthesis straight g right parenthesis space rightwards arrow space space 2 HBr left parenthesis straight g right parenthesis$

Given that bond enthalpy of H – H, Br – Br and H – Br bonds are 435 kJ mol^–1, 192 kJ mol^–1 and 368 kJ mol^–1 respectively.

Solution

We know that
$increment subscript straight r straight H to the power of 0 space equals space sum from blank to blank of Bond space enthalpies subscript left parenthesis Reactants right parenthesis end subscript space minus space sum from blank to blank of Bond space enthalpies subscript left parenthesis Products right parenthesis end subscript space space space space space space space space equals space open square brackets straight H to the power of 0 subscript straight H minus straight H end subscript space plus space straight H subscript Br space minus Br end subscript superscript 0 close square brackets space minus space open square brackets 2 space cross times space straight H subscript straight H space minus space Br end subscript superscript 0 close square brackets$
$equals space open square brackets 435 space kJ space mol to the power of negative 1 end exponent space plus space 192 space kJ space mol to the power of negative 1 end exponent close square brackets space minus space open square brackets 2 cross times 368 space kJ space mol to the power of negative 1 end exponent close square brackets equals space 627 space kJ space mol to the power of negative 1 end exponent space minus space 736 space kJ space mol to the power of negative 1 end exponent space equals negative 109 space kJ space mol to the power of negative 1 end exponent$

Some More Questions From Thermodynamics Chapter

For Daily Free Study Material Join wiredfaculty

Thermodynamics

Some More Questions From Thermodynamics Chapter

Define state variables of a system.

From thermodynamic point of view, to which system the animals and plants belong?

What is a state function?

A thermodynamic state function is a quantity

What is reversible process in thermodynamics?

Define irreversible change.

Name the variable that is kept constant in isochoric process and isobaric process.

Give one difference between an isothermal and an adiabatic process.

For the process to occur under adiabatic conditions, the correct condition is

Define internal energy of a system

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Phone Number

Email Address

Loaction

For Daily Free Study Material Join wiredfaculty

Thermodynamics

Estimate the enthalpy change for the reaction:Given that bond enthalpy of H – H, Br – Br and H – Br bonds are 435 kJ mol–1, 192 kJ mol–1 and 368 kJ mol–1 respectively.

Some More Questions From Thermodynamics Chapter

Define state variables of a system.

From thermodynamic point of view, to which system the animals and plants belong?

What is a state function?

A thermodynamic state function is a quantity

What is reversible process in thermodynamics?

Define irreversible change.

Name the variable that is kept constant in isochoric process and isobaric process.

Give one difference between an isothermal and an adiabatic process.

For the process to occur under adiabatic conditions, the correct condition is

Define internal energy of a system

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation