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Question

Which aqueous solution has a molarity of 1.0 M?

A
73 grams of HCl dissolved to make 2.0 liters of solution
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B
360 grams of C6H12O6 dissolved to make 1.5 liters of solution
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C
94 grams of K2O dissolved to make 0.75 liters of solution
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D
24 grams of LiOH dissolved to make 1.25 liters of solution
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E
40 grams of HF dissolved to make 2.50 liters of solution
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Solution

The correct option is A 73 grams of HCl dissolved to make 2.0 liters of solution
The following aqueous solution has a molarity of 1.0 M
73 grams of HCl dissolved to make 2.0 litres of solution
The molar mass of HCl is 36.5 g/mol. The number of moles of HCl is the ratio of its mass to molar mass. The number of moles of HCl =73g36.5g/mol=2 moles.
The molarity of HCl solution is the ratio of number of moles of HCl to volume of solution (in L).
Molarity =2.0 mol2.0L=1M

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