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Answer :
Taking into account the definition of molarity, the correct answer is option A): the molarity of a solution formed by dissolving 97.7 g LiBr in enough water to yield 750.0 ml of solution is 1.50 [tex]\frac{moles}{liter}[/tex].
Molarity is a measure of the concentration of a chemical solution, which refers to the moles of a solute in relation to the volume of a solution.
That is, molarity indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:
[tex]Molarity=\frac{number of moles of solute}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
On the other side, molar mass is defined as the mass of one mole of a substance, which can be an element or a compound.
Being the molar mass of LiBr 86.85 g/mole, the number of moles that 97.7 g of the compound contain is calculated as:
[tex]97.7 gramsx\frac{1 mole}{86.85 grams} = 1.128 moles[/tex]
Then, with the volume being 750 mL = 0.750 L (where 1000 mL = 1 L), the molarity is calculated as:
[tex]Molarity=\frac{1.128 moles}{0.750 L}[/tex]
Solving:
Molarity= 1.50 [tex]\frac{moles}{liter}[/tex]
Finally, the correct answer is option A): the molarity of a solution formed by dissolving 97.7 g LiBr in enough water to yield 750.0 ml of solution is 1.50 [tex]\frac{moles}{liter}[/tex].
Learn more about molarity with this example: brainly.com/question/15406534?referrer=searchResults
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Answer:
A. 1.50 M
Explanation:
Concentration is the number of moles of solute dissolved in a volume of 1 L of solution
Mass of LiBr - 97.7 g
Number of moles of LiBr - 97.7 g /87 g/mol = 1.12 mol
Equation for concentration is as follows
Concentration = number of moles / volume of solution in L
Substituting the values
Concentration = 1.12 mol / 0.7500 L
Concentration of LiBr is 1.50 mol/L
