How can I convert the number of particles per liter to gram per liter

How can I convert the number of particles per liter to gram per liter? I know the size of these particle and so, I calculated the volume and then by the density I calculate the mass. After that I don't know what to do




$$x \frac{particles}{L} \times \frac {1 mol}{6.023 \times 10^{23}particles}\times \frac{MW gm}{mol}$$


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I would go with the Avogadro constant -> calculate how many moles per liter there are in your mixture and then, using the molecular mass, you can calculate the concetration in g/L. That is if you know your compound.


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