Question

Consider the reaction below. If you start with 2.00 moles of C3H8 (propane) and 2.00 moles of O2, how many moles of carbon dioxide can be produced? C3H8(g) + 5O2(g) 3CO2(g) + 4H2O(g). A) 8.00. B) 1.20. C) 6.00. D) 2.00.

Answer 1

From the balanced chemical reaction, the ratio of moles of propane to moles CO2 produced is 1/3. Given 2 moles of propane, 6 moles of CO2 is produced. Further, the ratio of moles of O2 to moles of CO2 produced is 5/3. Given 2 moles of oxygen, 1.2 moles of CO2 is produced. We take the smaller amount of CO2 as the answer. Thus, the answer is letter B. 1.2 moles