m pur Mg = 0,94×30 = 2,82g Mg
n = m/M = 2,82/24 = 0,1175 moli Mg
Mg + 1/2O2 => MgO
a) 1 mol Mg............0,5×22,4L O2
0,1175 moli Mg.......x = 1,316L O2
b)n Mg = n MgO = 0,1175 moli
m MgO = 0,1175×40 = 4,7g MgO
ms = 4,7+300 = 304,7g
C = 4,7/304,7×100 = 1,542%