A chemist needs 0.550 mol selenium for a reaction. What mass of selenium should a chemist use? *show work and giving brainliest*

Reducing agents  oxidized by the reaction 

Answer is: hydrogen is being oxidized.chemical reaction: co₂ + h₂ → co + h₂o.oxidation half reaction: h₂ → 2h⁺ + 2e⁻.reduction half reaction: c⁺⁴ + 2e⁻ → c⁺².oxidation is increase of oxidation number, hydrogen change oxidation number from neutral charge (in molecule of hydrogen) to oxidation number +1 (in water).

I'd say your answer would be the sides of a metal pan become hot when the pan is placed on the stove burner

Dis the answer : ) good luck