1)molecular weight of NaCl = 58.44 g/mol
58.44 = 1.0 mole
20.0 g = 20 / 58.44 =0 .34 moles
so 0.34 moles NaCl produced.
2) cording to balaced reaction
2 moles of NaCl produced by consuming 1 mole Cl2
0.34 moles NaCl produced by consuming (0.34 x 1.0) / 2= 0.17 moles Cl2
1 mole Cl2 = 71 g
0.17 moles = 0.17 x 71 = 12.07g Cl2
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