Question

Urgentttttttttttttt!
1.Cate grame de carbonat de calciu contin 16 grame de oxigen
2.cate grame de magneziu sunt continute in 2 moli de oxid de magneziu?

Answer 1

MCaCO3=ACa+AC+3AO=40+12+3*16=100g/mol

In 100g CaCO3 se gasesc.....................3*16=48g O
xg.............................................................16g O

x=100*16/3*16= Calculeaza !!

2. MMgO=AMg+AO=24+16=40g/mol

1 mol MgO................................24g Mg
2 moli MgO................................48g Mg