Answer:5
Explanation:(H3) is 3 (H3)2 is 5
The "Van Gogh" one is subjective, because it expresses opinion and is not a true, hard fact. :)
The correct answer is "B. Make a Hypothesis".
The equation is:
3 O₂ + 4 Co → 2 Co₂O₃
Oxidation half reaction:
Co → Co³⁺ + 3 e
Reduction half reaction:
O₂ + 4 e → 2 O²⁻
To balance the equation number of electrons lost must be equal to number or electrons gained so we must multiply oxidation half time 4 and reduction half times 3
