Question

If 42.389 g of Fe3Br2 is dissolved in enough water to give a total volume of 750 mL, what is the molarity of the solution

Answer 1

Answer:

$M=0.173M$

Explanation:

Hello!

In this case, since the molarity of a solution is defined in terms of the moles of solute divided by the volume of the solution in liters and has units of mol/L or M:

$M=\frac{n}{V}$

For the solute, Fe3Br2, which has a molar mass of 327.3430 g/mol, the moles in 42.389 g are:

$n=42.389g*\frac{1mol}{327.3430g} =0.12949mol$

Thus, since the volume in liters is 0.750 L from those given 750 mL, the molarity turns out:

$M=\frac{0.12949mol}{0.750L}\\\\M=0.173M$

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