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Question

480 ml of 1.5 M non-electrolyte solution is mixed with 520 ml of 1.2 M non-electrolyte solution. What is the molarity of the final mixture?

A
2.70 M
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B
1.344 M
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C
1.50 M
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D
1.20 M
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Solution

The correct option is B 1.344 M
Given,

V1=480mL, M1=1.5M

We know,

M1=n1V1 [Molarity formula]

n1=M1V1=1.5×480×103L

n1=720×103 moles

Also, V2=520mL, M2=1.2M

We know M2=n2V2

n2=1.2×520×103

n2=624×103 moles

Total no. of moles in the solution =1.344

Also, total volume of the mixture =480+520=1000mL=1L

Now,
Molarity =no. of moles1L

=1.3441 M

Molarity of final mixture =1.344M

Hence, the correct option is B

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