How do I solve this chemistry question?

Hi, I have tried so many methods but I cannot figure out the steps or the answer of this to save my life Dx.

What mass (in mg) of sodium benzoate (C_7 H_5 O_2 Na) is present in 4.56 x 10^2 mL of a 0.345 M solution?

I mainly had trouble converting from moles to milligrams. Thank you soo much!!
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