Question

Calculați compoziția procentuală a oxidului de magneziu

Answer 1

MgO

MMgO=24+16=40

40 g MgO-----24 gMg--------16 gO
100 gMgO------x g Mg--------y g O
X=100.24:40=60 la suta Mg
Y=100.16:40=40 la suta O

Answer 2

M MgO= 24+16= 40g/mol
 40 g MgO...........24g Mg...................16g O
  100g ....................X..............................Y

X=100*24/40=60% Mg

Y=100*16/40=40% O