Can somebody help me?

The answers to your questions are given below

Explanation:

A. Fe + O2 —> Fe2O3

4Fe + 3O2 —> 2Fe2O3

The coefficients are 4, 3, 2

B. H2 + Cl2 —> HCl

H2 + Cl2 —> 2HCl

The coefficients are 1, 1, 2

C. Ag + H2S —> Ag2S + H2

2Ag + H2S —> Ag2S + H2

The coefficients are 2, 1, 1, 1

D. CH4 + O2 —> CO2 + H2O

CH4 + 2O2 —> CO2 + 2H2O

The coefficients are 1, 2, 1, 2

E. HgO —> Hg + O2

2HgO —> 2Hg + O2

The coefficients are 2, 2, 1

F. Co + H2O —> Co2O3 + H2

2Co + 3H2O —> Co2O3 + 3H2

The coefficients are 2, 3, 1, 3

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8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.