Andy21
Nov21-10, 04:19 AM
1. The problem statement, all variables and given/known data
When using Hess' law to calculate the enthalpy change for the thermal decomposition of sodium hydrogen carbonate, why doesn't the enthalpy change of the reaction of one mole of NaHCO3 with H2SO4 (reaction 1) have to be doubled when you calculate the reaction of 2 moles of NaHCO3 with H2SO4 to produce Na2SO4 + 2CO2 + 2H2O.
2. Relevant equations
Reaction of the thermal decomposition-2NaHCO3->Na2CO3 + CO2 + H20
Reaction 1- 2NaHCO3 + H2SO4->Na2SO4 + 2CO2 + 2H2O
3. The attempt at a solution
When using Hess' law to calculate the enthalpy change for the thermal decomposition of sodium hydrogen carbonate, why doesn't the enthalpy change of the reaction of one mole of NaHCO3 with H2SO4 (reaction 1) have to be doubled when you calculate the reaction of 2 moles of NaHCO3 with H2SO4 to produce Na2SO4 + 2CO2 + 2H2O.
2. Relevant equations
Reaction of the thermal decomposition-2NaHCO3->Na2CO3 + CO2 + H20
Reaction 1- 2NaHCO3 + H2SO4->Na2SO4 + 2CO2 + 2H2O
3. The attempt at a solution