Answer to Question #91389 in General Chemistry for alivia

Question

based on the reaction: 2C2H2+5O2=4CO2+2H2O
when 16 mol C2H2 react with 25 mol O2, what is the theoretical yield of CO2 in moles?

Answer 1

1. Consider the ratio of substances in the reaction:

$$2n(C_2H_2) : 5n(O_2)$$

That is, the ratio of ethine С₂Н₂ to oxygen O₂ is 2 to 5, or 1 to 2.5

2.According to the condition, the ethin C₂H₂ to oxygen O₂ ratio 16 : 25, or 1 : 1.5625.

Therefore, ethine C₂H₂ is in excess, we calculate on oxygen O_2.

3.Consider the ratio of oxygen O₂ to carbon dioxide CO₂:

$$5n(O_2) : 4n(CO_2)$$

$$n(CO_2) = (25/5)*4 = 20 (mol)$$

Answer: 20 mol