For the reaction below (which will be labeled reaction A), the reaction enthalpy is unknown: 2 B + 3 H2 B2H6 HA = ? Use the following thermochemical data to calculate the reaction enthalpy ΔHA: Reaction 1: 4 B + 3 O2 → 2 B2O3 ΔH1 = –2509 kJ Reaction 2: 2 H2 + O2 → 2 H2O ΔH2 = –572 kJ Reaction 3: B2H6 + 3 O2 → B2O3 + 3 H2O ΔH3 = –2,159 kJ Calculate the enthalpy of reaction A (in kJ) and enter the numerical value in the answer box. Do not write units in the answer box. Clearly show on a paper how each reaction can be combined to equal reaction A (multiply or reverse each of the above reactions).complete work must be uploaded
For the reaction below (which will be labeled reaction A), the reaction enthalpy is unknown:
2 B + 3 H2 B2H6 HA = ?
Use the following thermochemical data to calculate the reaction enthalpy ΔHA:
Reaction 1: 4 B + 3 O2 → 2 B2O3 ΔH1 = –2509 kJ
Reaction 2: 2 H2 + O2 → 2 H2O ΔH2 = –572 kJ
Reaction 3: B2H6 + 3 O2 → B2O3 + 3 H2O ΔH3 = –2,159 kJ
Calculate the enthalpy of reaction A (in kJ) and enter the numerical value in the answer box. Do not write units in the answer box.
Clearly show on a paper how each reaction can be combined to equal reaction A (multiply or reverse each of the above reactions).complete work must be uploaded
The enthalpy change is a state function and the Hess law states that the change of enthalpy in a chemical reaction is independent of the pathway between the initial and final states. According to this law, the total enthalpy change during a complete chemical reaction is the same whether the reaction is made in one step or in several steps.
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