If 2.0 liters of oxygen gas react with excess carbon monoxide at stp, how many liters of carbon dioxide can be produced under the same conditions?
2co (g) + o2 (g) yields 2co2 (g)
a 1.0 l
b 2.0 l
c 4.0 l
s 6.0 l

Balanced equation
2CO (g) + O2 (g) yields 2CO2 (g)

Stoichiometry
1 moles of Oxygen produce 2 moles of Carbon dioxide

Number of moles is proportional to Volume [same temperature and same pressure]

Then 2 liters of Oxygen produce 4 liters of carbon dioxide.

Answer C: 4.0 L

Answer///an early form of the atomic theory; dalton atomic theory;

Answer is: the equilibrium  shifts toward the reactants, to the left side of chemical reaction.it is because lead(ii) nitrate dissociates in water: pb(no₃)₂ → pb²⁺(aq) + 2no₃⁻(aq).according to lechatelier's principle, the position of equilibrium moves to counteract thechange (more lead cations, common ion), the position of equilibrium will move so that the concentration ofproducts decrease and concentration of reactants of chemical reaction increase.read more on -