Question

. If 12 g of carbon burns completely in 40 g oxygen in a closed container, the product has
a) 44 of carbon dioxide (b) 8 g of oxygen (c) 32 g of oxygen (d) 52y of carbon dioxide​

Answer 1

44 grams of carbon dioxide is released from the reaction in the container. (Option A)

• Inside the container, a combustion reaction occurs in which the carbon burns in presence of oxygen to release carbon dioxide gas as the end product of the reaction.
• Amount of completely burnt carbon in a closed container = 12 grams = 1 mole. (Since the molar mass of carbon is 12 grams)
• Amount of oxygen present in the closed container = 40 grams = 1.25 moles. (Since the molar mass of oxygen gas is 32 grams)
• As the number of moles of carbon is lesser than that of oxygen, hence carbon acts as the limiting reagent and all carbon is used up in the reaction but extra oxygen remains unused.
• As per the balanced chemical equation of the reaction, one mole of carbon reacts with one mole of oxygen to release only one mole of carbon dioxide.
• So, in this reaction, only one mole, that is, 44 grams of carbon dioxide is released. (Since the molar mass of carbon dioxide is 44 grams)
• That's why 44 grams of carbon dioxide is the correct answer to this question.