LIVE Course for free

Rated by 1 million+ students
Get app now
+2 votes
in Chemistry by (65.3k points)

If the density of methanol is 0.793 kg L–1, what is its volume needed for making 2.5 L of its 0.25 M solution?

1 Answer

+3 votes
by (29.7k points)
selected by
Best answer

Solution: We know that

The molarity of a solution is defined as  M = number of moles of solute/ Volume of solution (in litres)   = (mass of solute/ molar mass of solute)X (1/ Volume of solution (in litres)

Let x g of methanol (molar mass = 32g) be required to prepare a 0.25 Molar solution of methanol. 

Therefore we have  0.25 = (x/32) X (1/2.5)  

x = 20g = 0.02 Kg

Now density = Mass/ Volume 

We are given that the density of methanol is 0.793 KgL-1

Therefore,   Volume = Mass/ Density  = 0.02/0.793  = 0.025 Litres

Therefore 0.025 Litres of methanol would be required.

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.