Question

An aqueous solution of concentrated hydrobromic acid contains 48% hbr by mass. if the density of the solution is 1.50 g / ml, what is its concentration

Answer 1

Hbr = 48g 
Moles = 48 / 80 
moles = 0.6 

Mass o f water = 52 g 
Molality = (0.6 / 52 ) x1000
Molality = 11.53 

Calculation of molarity 
moles of Hbr = 0.6 

Volume of solution = 100 / 1.50 
                                = 66.66 ml 

Molarity = (0.6 / 66.66 ) x 1000
Molarity = 9.0009 M

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