Answer to Question #70451 in General Chemistry for B

Question

How many moles of O2 would be needed to react with 4.35 moles of CS2 in the reaction
CS2 + 3 O2 ———> CO2 + 2 SO2

Answer 1

According to Avogadro’s law (equal volumes of all gases, at the same temperature and pressure, have the same number of molecules) and Gay-Lussac's law (the ratio between the volumes of the reactant gases and the gaseous products can be expressed in simple whole numbers) in the reaction 1 mole of CS2 reacts with 3 moles of O2. Thus 4.35 moles of CS2 react with 3×4.35 = 13.05 (moles) of O2.