Ways to calculate AHRXN°: 1. Direct Method: Use this method if the cpd of interest can readily be synthesized Ex: Calculate the standard enthalpy of reaction for the following (use tabulated values: Table 6.4)) 2C0(g) + O2(g) → 2CO2(g)
Ways to calculate AHRXN°: 1. Direct Method: Use this method if the cpd of interest can readily be synthesized Ex: Calculate the standard enthalpy of reaction for the following (use tabulated values: Table 6.4)) 2C0(g) + O2(g) → 2CO2(g)
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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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PLEASE SOLVE QUESTION 1 AND 2, I WANT TO SEE THE DIFFERENCE BETWEEN THOSE TWO DIRECT AND INDIRECT METHOD
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Ways to calculate AHRXN°:
1. Direct Method:
Use this method if the cpd of interest can readily be
synthesized
Ex: Calculate the standard enthalpy of reaction for the
following (use tabulated values: Table 6.4))
2C0(g) +
O2(g) → 2C02(g)
7:06 PM
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21
11/13/2020
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:
Transcribed Image Text:General Chemistry I: SA FA20| Sc X
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Chapter_6.pdf
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2. Indirect Method
Use this method if the cpd of interest has to be made in
a series of steps:
Hess's Law- when reactants are converted into
products, the change in enthalpy is the same whether
the reaction takes place in one step or a series of steps
Ex: For the following reaction:
C(graphite) + 2H2(g) → CH4(g)
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Expert Solution
Step 1
1. Direct method:
The given reaction is -
2CO(g) + O2(g) ----> 2CO2(g)
COThen, the standard enthalpy of the reaction ∆rxnH will be
∆rxnH° = Σ∆Hp° - Σ∆Hr°
where ∆Hp° is the enthalpy of formation of products and ∆Hr° is the enthalpy of the reactants.
For the above reaction-
∆rxnH° = ∆Hf(CO2) - [∆Hf(O2) + ∆Hf(CO)]
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