Q. 34.1( 145 Votes )

Calculate the mol

Answer :

Molarity is the concentration of a solution expressed as the number of moles of solute per litre of solution.


Molarity =


(a) Given,


In 4.3 L of solution there is 30 g of Co(NO3)2. 6H2O


Molar mass of Co(NO3)2.6H2O = (1 × 59 + 2 × (1 × 14 + 3 × 16) + 6 × 18)


= 291 g/mol.


Moles = = 0.103 mol.


Now, Molarity =


= 0.023 M


(b) Given,


30 mL of 0.5 M H2SO4 diluted to500 mL.

Applying the formula,

  M1V1 = M2V2

 
where, M1 = 0.5 M
           V1 = 30 ml
           M2 = ?
           V2 = 500 ml
      
       ⇒0.5M × 30 ml = M2 × 500 ml
 
        so,M2= 0.03 M.

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