Carbon dioxide (CO_2) is a known greenhouse gas that is formed from the combusti

Question

Carbon dioxide (CO_2) is a known greenhouse gas that is formed from the combustion of hydrocarbons, as shown in the reaction below. C_5 H_12 + O_2 CO_2 + H_2 O a. Balance the equation b. Calculate the percent atom economy based on carbon dioxide as the target product. c. Calculate the number of grams of CO_2 formed if you burn 10.0 grams of C_5 H_12. d. Using the information from the Atom Economy essay, calculate the percent yield of the reaction if 25 .4 grams of CO_2 are formed at the end of the reaction. e. Using your results, explain the difference between percent yield and percent atom economy.

Explanation / Answer

2. Combustion of C5H12

a. Balanced equation

C5H12 + 8O2 --> 5CO2 + 6H2O

b. Percent atom economy based on CO2 as target product

= (5 x 44) x 100/(72 + 8 x 32)

= 67.07%

c. grams of CO2 formed = (10/72.15) x 5 x 44.01

                                       = 30.50 g

d. Percent yield = 25.4 x 100/30.50

                          = 83.28%

e. The difference between the percent atom economy and percent yield comes from the fact that not all of strating material is conbusted in actual reaction.

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