Answer :
Molarity of the solution formed by dissolving 97.7 grams LiBr in enough water to yield 750 mL of solution is 1.50 M.
To find the molarity of the solution, we need to first determine the moles of LiBr and then divide it by the volume of the solution in liters.
Molarity (M) = moles of solute / volume of solution in liters
1. Calculate the moles of LiBr:
LiBr has a molar mass of 86.84 g/mol (6.94 g/mol for Li and 79.9 g/mol for Br).
moles of LiBr = (97.7 g) / (86.84 g/mol) = 1.125 moles
2. Convert the volume of the solution to liters:
750 mL = 750 / 1000 = 0.750 L
Now, we can calculate the molarity by dividing the moles of LiBr by the volume of the solution in liters:
M = (1.125 moles) / (0.750 L) = 1.50 M
The molarity of the LiBr solution is 1.50 M.
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