Question

If you dissolve 25.5 g KBr in enough water to make 1.75 L of solution, what is the molarity of the solution?

Answer 1

Molar mass of KBr = 1*MM(K) + 1*MM(Br)

= 1*39.1 + 1*79.9

= 119 g/mol

mass of KBr = 25.5 g

we have below equation to be used:

number of mol of KBr,

n = mass of KBr/molar mass of KBr

=(25.5 g)/(119 g/mol)

= 0.2143 mol

volume , V = 1.75 L

we have below equation to be used:

Molarity,

M = number of mol / volume in L

= 0.2143/1.75

= 0.122 M

Answer: 0.122 M

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