Помогите 18.10,18.11,18.14Срочно

Question

Помогите 18.10,18.11,18.14
Срочно

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Answer 1

18.10
2O3=3O2
2.4g - x
48 - 48
48x=48*2.4
x=2.4g
Ответ:m(O2)=2.4g
18.11
H20=16*100/18=88.8%(O2)
SiO=32*100/60=53.4%(O2)
Fe2O3=48*100/160=30%(O2)
18.14
K2O
MgO
Al2O3