Here's how to calculate the concentration of FeCl3 in the solution:

1. Calculate the moles of FeCl3

* Molar mass of FeCl3:

* Fe: 55.845 g/mol

* Cl: 35.453 g/mol

* Total: 55.845 + (3 * 35.453) = 162.204 g/mol

* Moles of FeCl3: (10.0 g FeCl3) / (162.204 g/mol) = 0.0617 mol FeCl3

2. Calculate the concentration in Molarity (mol/L)

* Convert mL to L: 275 mL * (1 L / 1000 mL) = 0.275 L

* Molarity (M): (0.0617 mol FeCl3) / (0.275 L) = 0.224 M FeCl3

Therefore, the concentration of FeCl3 in the solution is 0.224 M.