Respostas

2014-04-11T22:36:22-03:00

 HCl  + NaOH ~> NaCl + H2O
 35g -----40g ----------x-------45g

Lei de Poust

35 + 40 = x + 45

75 = x + 45

x = 75 - 45

x = 30 gramas de NaCl