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Chemistry
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19 Nov 2019


For the following reaction, 4.38 grams of hydrogen gas are mixed with excess ethylene (C2H4) . The reaction yields 54.3 grams of ethane (C2H6) .

hydrogen ( g ) + ethylene (C2H4) ( g ) ethane (C2H6) ( g )

What is the theoretical yield of ethane (C2H6) ?

What is the percent yield for this reaction ?

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Related questions

A new catalyst is being developed with the hope of generating ethylene by the oxidative dehydrogenation of ethane, reaction (1). Two side reactions accompany the main reaction; these are the combustion reactions (2) and (3). A goal of the development effort is to react a mixture of 90% ethane and 10% air (you may take air to contain 79% N2 and 21% O2) at 1 atm and 150 degrees C. It is desired to operate at 50% conversion of O2 with a selectivity of 3 C2H4/CO2.


(1) 2 C2H6 + O2 --> 2 C2H4 + 2 H2O

(2) 2 C2H6 + 7 O2 --> 4 CO2 + 6 H2O

(3) C2H4 + 3 O2 --> 2 CO2 + 2 H2O


If the process goals are met, what will be the final mole fraction of ethylene?

​Compounds with carbon-carbon double bonds, such as ethylene, C2H4, add hydrogen in a reaction called hydrogenation.

C2H4(g)+ H2(g)---> C2H6(g)

Calculate the enthaply change for this reaction, using the following combustion data:

C2H4(g)+ 3O2(g)---> 2H2O(l), (delta) H = -1411 KJ

C2H6(g)+ 7/2O2(g)---> 2CO2(g)+ 3H2O(l), (delta) H = -1560 KJ

H2(g)+ 1/2O2(g)---> H2O(l), (delta) H = -286 KJ

(a) Draw Lewis structures for ethane (C2H6), ethylene (C2H4), and acetylene (C2H2). (b) What is the hybridization of the carbon atoms in each molecule? (c) Predict which molecules, if any, are planar. (d) How many σ and π bonds are there in each molecule?

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