LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
in Gaseous State by (47.9k points)
closed by

Give an expression for the van der Waals equation. Give the significance of the constants used in the equation. What are their units?

1 Answer

+1 vote
by (46.8k points)
selected by
Best answer

Where n is the number of moles present and ‘a’’ b’ are known as van der Waals constants.

Significance of Van der Waals constants: 

Van der Waals constant ‘a’: ‘a’ is related to the magnitude of the attractive forces among the molecules of a particular gas. Greater the value of’a’ , more will be the attractive forces. 

Unit of’a’ = L2 mol-2

Van der Waals constant ‘b’: ‘b’ determines the volume occupied by the gas molecules which depends upon size of molecule. 

Unit of ‘b’ = L mol-1

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.