completatu spatile libere cu formele chimice ale reactantilor sau ale produsilor de reactie si stabileste cofecienti stometrici pentru ecuatile reactilor

A) .........H2+..........O2----------》.........
b).....................+.............CO2----------》H2CO3
c) .....................+...............S--------》......SO2
d) ................+..............N2--------》.....NH3

e) ...........MgO.........---------》........Mg(OH)2

f) .................Al +...........O2----------》............​