Why is ∆H negative in an exothermic reaction?

Solution

Exothermic reactions are accompanied by the evolution of heat. It means that enthalpy of the reactants is more than the enthalpy of the products i.e.
H_r > H_p
But $increment straight H space equals space straight H subscript straight P space minus space straight H subscript straight R$
$therefore space space space space increment straight H space is space minus ve$

Some More Questions From Thermodynamics Chapter

Classify the following into different types of systems:
(i) Tea placed in a cup
(ii) Tea placed in a tea-pot
(iii) Tea placed in a thermosflask.

Define a closed system.

For Daily Free Study Material Join wiredfaculty

Thermodynamics

Why is ∆H negative in an exothermic reaction?

Some More Questions From Thermodynamics Chapter

Classify the following into different types of systems:
(i) Tea placed in a cup
(ii) Tea placed in a tea-pot
(iii) Tea placed in a thermosflask.

Define a closed system.

Define an isolated system.

Define intensive properties.

Define extensive properties.

Why all living systems need to be 'open systems'?

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

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Phone Number

Email Address

Loaction

For Daily Free Study Material Join wiredfaculty

Thermodynamics

Why is ∆H negative in an exothermic reaction?

Some More Questions From Thermodynamics Chapter

Classify the following into different types of systems:(i) Tea placed in a cup(ii) Tea placed in a tea-pot(iii) Tea placed in a thermosflask.

Define a closed system.

Define an isolated system.

Define intensive properties.

Define extensive properties.

Why all living systems need to be 'open systems'?

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

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Classify the following into different types of systems:
(i) Tea placed in a cup
(ii) Tea placed in a tea-pot
(iii) Tea placed in a thermosflask.