Respostas

2014-02-19T22:00:56-03:00
8g ------------ 1000ml (1L)
x-----------------250 ml

x = 2 g de MgCl2


2014-02-19T23:38:18-03:00
Em 1L  temos 1000ml   logo 250ml/1000ml = 0,25*8g

2g de MgCl2