Kc =[CO2]2/[CO]2[O2] is the equilibrium constant for which chemical reaction?

Group of answer choices

CO + O2 ↔ CO2

2CO + O2 ↔ 2CO2

2CO2 ↔ 2CO + O2

CO + 1 2 O2 ↔ CO2

Becca wants to mix fruit juice and soda to make a punch. she can buy fruit juice for $3 a gallon and soda for $4 a gallon. if she wants to make 28 gallons of punch at a cost of $3.25 a gallon, how many gallons of fruit juice and how many gallons of soda should she buy?