Na2CO3
g)
46g Na.........106g Na2CO3
x....................300g Na2CO3
x = 300*46/106 = 130,19g Na
h)
48g O........106g Na2CO3
32g O...........x
x = 32*106/48 = 70,67g Na2CO3
i)
20% impuritati => 80% puritate
p = mp*100/mimp => mp = p*mimp/100 = 80*200/100 = 160g Na2CO3