Question

The complete combustion of ethanol, c2h5oh(l), to form h2o(g) and co2(g) at constant pressure releases 1235 kj of heat per mole of c2h5oh. write a balanced equation for this reaction.

Answer 1

Since it was specifically stated that heat is released, therefore heat is located on the right side of the reaction equation. Also stating the states of each compound, the complete balanced reaction would be:

C2H5OH (l) + 3 02 (g) -----> 2 CO2 (g) + 3 H2O (g) + 1235 kJ

Answer 2

The balanced combustion reaction will be

$\rm \bold {C_2H_5OH_ (_l_) + 3 0_2 _(_g_) \rightarrow 2 CO_2 _(_g_) + 3 H_2O (g) + 1235 kJ}$

To write a balanced equation

• We will carefully put reactant in the left and product into the right.
• The energy released will be mentioned in right.
• The states of reactant and product will also mentioned.

Hence, balanced reaction will be

$\rm \bold {C_2H_5OH_ (_l_) + 3 0_2 _(_g_) \rightarrow 2 CO_2 _(_g_) + 3 H_2O (g) + 1235 kJ}$

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