At a certain temperature, kc equals 1.4 × 102 for the reaction: 2 co(g) + o2(g) ⇌ 2 co2(g). if a 3.50-l flask contains 0.400 mol of co2 and 0.100 mol of o2 at equilibrium, how many moles of co are also present in the flask? a) 0.700 mol b) 0.200 mol c) 0.107 mol d) 0.0114 mol

Ithink is a because if say increased in electronegativity

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na

Ithink its called the coefficent.