Calculate the ΔHrxn for the following reactions using the heats of formation given in the table at the end of this assignment:
a)The complete combustion of methane, CH4, producing water as a liquid.
b)The complete combustion of glucose, C6H12O6, producing water as a liquid.
c)The reaction of iron(III) oxide with carbon monoxide to produce solid iron and carbon dioxide.
d)The reaction of aluminum with Fe3O4
e)The combustion of carbon monoxide, producing carbon dioxide gas.
I know how to do the delta Hrxn part- however; how do you write the original equation, I can balance it after that and solve the problems.
Unbalanced.
CH4(g) + O2(g) ==> CO2(g) + H2O(l)
C6H12O6(s) + O2(g) ==> CO2(g) + H2O(l)
Fe2O3(s) + CO(g) ==> CO2(g) + Fe(s)
Fe3O4(s) + Al(s) ==> Al2O3(s) + Fe(s)
CO + O2 ==> CO2
I wonder what your trouble is in predicting the products. In some cases here they told you the products; in others they told you one of them and I thought the other was obvious.
To write the original equation, you need to identify the reactants and the products for each reaction. Let's break down each reaction and determine the reactants and products:
a) The complete combustion of methane, CH4, producing water as a liquid.
Reactant: Methane (CH4)
Product: Water (H2O)
b) The complete combustion of glucose, C6H12O6, producing water as a liquid.
Reactant: Glucose (C6H12O6)
Product: Water (H2O)
c) The reaction of iron(III) oxide with carbon monoxide to produce solid iron and carbon dioxide.
Reactants: Iron(III) oxide (Fe2O3), Carbon monoxide (CO)
Products: Iron (Fe), Carbon dioxide (CO2)
d) The reaction of aluminum with Fe3O4.
Reactants: Aluminum (Al), Iron(III) oxide (Fe3O4)
Products: N/A (The products are not provided in the question, so let's assume that the products are aluminum oxide (Al2O3) and iron (Fe))
e) The combustion of carbon monoxide, producing carbon dioxide gas.
Reactant: Carbon monoxide (CO)
Product: Carbon dioxide (CO2)
Once you have identified the reactants and products, you can then balance the equations and solve for the ΔHrxn using the heats of formation given in the table.