Помогите,Срочно!!!!!!!!!!!

Question

Помогите,Срочно!!!!!!!!!!!

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Answer 1

2. P2O5 P(5) O(2), H2O H(1) O(2), SO3 S(6) O(2)
3.2KClO3--2KCl+3O2(p),  2Na+Cl2--2NaCl(c), Fe2O3+2Al--Al2O3+2Fe.
4.Mr(Al2O3)=(27*2)+(16*3)=102 w(Al2) 54/102*100%=52% w(O3)=48/102*100%=47%