The burning of ethanol in oxygen can be depicted using the following equation, C
ID: 506090 • Letter: T
Question
The burning of ethanol in oxygen can be depicted using the following equation, C_2H_5OH_(i) + 3O_2 rightarrow 2CO_2(g) + 3H_2O_(i)+ Heat Is this reaction endothermic or exothermic? Explain Is this reaction reversible? Explain Explain why it is necessary to have a '3' as prefix to O_2 in the chemical equation. Would this reaction occur spontaneously? Explain If 6 moles of ethanol are present in ample oxygen, how many mole(s) of carbon dioxide and water would be produced, respectively? Describe what is meant by the term activation energy. What do the bracketed I' and 'g' represent?Explanation / Answer
The given reaction C2H5OH+ 3O2 ------>2CO2(g)+3H2O(l)+ Heat
a)The reaction is combustion reaction so heat is produced and hence exothermic reaction.
b)Combustion reaction is not reversible since by removing heat, the reaction can not be reversed.
there are 2*2 =4 atoms of oxygen in CO2, 3 atoms of Oxygen H2O, total of 4+3= 7 atoms of oxygen.
c)There is one atom of oxygen in C2H5OH, balance oxygen atoms are 7-1=6 atoms which correspond to 3 O2 molecules.
d)Combustion reaction is generally spontaneous and the above reaction is spontaneous.
e) from the reaction, 1 mole of C2H5OH gives 2 moles of CO2 and hence 6 moles of C2H5OH reacts with ample of O2 to give 12 moles of CO2.
f) Activation energy is the minium amount of energy required for converting reactants into products
g) l represents liquid phase and g represents gas phase.
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