Baking soda decomposes on heating as follows, creating the holes in baked bread: Calculate the standard molar enthalpy of formation of NaHCO3(s) from the enthalpy of the baking soda decomposition reaction and the following information:?
2NaHCO3(s)----> Na2CO3(s)+CO2(g)+H2O(l)
ΔH°rxn = -129.3 kJ
ΔH°f [Na2CO3(s)] = -1131 kJ
ΔH°f [CO2(g)] = -394 kJ
ΔH°f [H2O(l)] = -286 kJ
2NaHCO3(s)----> Na2CO3(s)+CO2(g)+H2O(l)
ΔH°rxn = -129.3 kJ
ΔH°f [Na2CO3(s)] = -1131 kJ
ΔH°f [CO2(g)] = -394 kJ
ΔH°f [H2O(l)] = -286 kJ
1 Answer
Explanation:
We want the enthalpy associated with the following reaction...
And
And reasonably clearly, we cannot approach this directly. However, we can work with the given equation...
Now
And so....
And thus
Anyway, please check my arifmetik. All care taken but no responsibility admitted....