Get Answers to all your Questions

header-bg qa

A sample of KCl is placed in 50 ml of solvent. What should be the mass of the sample for the molarity to be 2M ?

  • Option 1)

    7.45 g

  • Option 2)

    7.81 g

  • Option 3)

    6.81 g

  • Option 4)

    7.0 g

 

Answers (4)

best_answer

As we learnt,

 

Molarity -

 Molarity (M) = (Number of moles of solute)/(volume of solution in litres)

 

- wherein

It is defined as the number of moles of the solute in 1 litre of the solution.

 

 

 

Number of Moles = molarity x volume

                            = 2 x 0.05 = 0.1

So, mass = (39 + 35.5) x 0.01g = 7.45 g


Option 1)

7.45 g

Option 2)

7.81 g

Option 3)

6.81 g

Option 4)

7.0 g

Posted by

Plabita

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

7.45

 

Posted by

siva kiran akshintala

View full answer

7.41

 

Posted by

siva kiran akshintala

View full answer

2*0.05=0.1

72.5*0.01=7.45.............

Posted by

RAJ KIRAN

View full answer