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?

Kc is the equilibrium constant and depicts the reactants or the product concentration. At equilibrium, the moles of the carbon monoxide is 0.200 moles.

Moles is the ratio of the mass of the substance to that of the molar mass of the substance.

The balanced chemical reaction is given as,

The known concentration of oxygen is calculated as:

The known concentration of carbon dioxide is calculated as:

The concentration of the carbon monoxide is calculated as:

Moles of the carbon monoxide is calculated as:

Therefore, at equilibrium, the moles of the carbon monoxide is 0.200 mol.

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Explanation:

The balanced equation is

2CO + O₂ ⇌ 2CO₂

Step 1. Calculate the known concentrations.

Step 2. Calculate the concentration of CO

3. Calculate the moles of CO

n = 3.50 L × 0.057 14 mol·L⁻¹ = 0.200 mol

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