Using the dilution equation
M1V1=M2V2
M1 is the initial molarity, V1 the initial volume, while V2 is the final volume after dilution, while M2 is the molarity after dilution.
Hence
41 × 3.41 = 279 × M2
M2 = (41 ×3.41)/279
= 0.5011 M
Therefore; the molarity after dilution is 0.5011 M