Verified answer

Normalidad=moles soluto/1L disolución

0.5=moles soluto /0.5L

mol=0.5*0.5L=0.25

0.25mol*40g/mol=10g

1 mol de NaOH = 40 g

1 N -------------------- 40 g/l

0,5 N ---------------- 0,5*40/1 = 20 g/l

en 1.000 ml -------------- 20 g

en 500 ml ------------- 500*20/1.000 = 10 g

10g

N = M (para el NaOH)

M = n/V

n = M * V

n = 0.5mol/L * 0.5L = 0.25mol

1 mol son 40g

entonces 0.25mol son 10g