Molarity of solutions and dilutions?

A standard solution of potium dichromate, K2Cr2O7 (MM=294.2/mole) is prepared for dilution.First a stock solution of potium dicromate is prepared by dissolving 25.00 grams in a total volume of 500.0mL. Second a 5.000mL portion of this stock solution is placed in a flask and diluted to a final volume of 100.0mL. Calculate the molarity of the final solution.