For the reaction 2Na(s) + Cl(g) �¨2NaCl(s), how many grams of NaCl could be produced from 103.0 g of Na and 13.0 L of Cl (at STP)?

I have a problem with your equation: Chlorine gas is Cl2.

I would do this one on mass. YOu know 2*molemass of Cl2 occupies 22.4 l at stp, so

massCl2=13/22.4 * 2*35.4= you do it.

massNa+ massCl2=mass salt

solve formass salt.