Calculate the molarity of a solution prepared by diluting

Question

Calculate the molarity of a solution prepared by diluting 118 mL of 0.230 M K₂Cr₂O₇ with 749 mL of water.

How many milliliters of 0.761 M H₃PO₄ will contain the following?  0.14 mol H₃PO₄

3Ca(NO3)2(aq) + 2Na3PO4(aq) = Ca3(PO4)2(s) + 6NaNO3(aq), calculate the volume of 0.30 M Na₃PO₄ needed to react with 22 mL of 0.72 M Ca(NO₃)₂

2KMnO4 (aq) + 16 HCl (aq) = 2MnCl2 (aq) + 5Cl2 (g) + 8H2O (l) + 2KCl (aq), calculate the liters of Cl₂ gas at STP produced by the reaction of 121 mL of 2.1 M HCl & calculate the liters of Cl₂ gas at STP produced by the reaction of 14.4 mL of 0.693 M HCl and 11.8 mL of 0.654 M KMnO₄