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Mm NaCl = 58 g/mol
masa = 23 g de NaCl
v solución = 500 mL /1000 = 0.500 L
n (moles) = masa/ Mm
n = 23 g / 58 g/mol
n = 0.396 mol
M = 0.396 mol / 0.500 L
M = 0.792 mol/L