Methanoic acid, HCOOH(aq) , is a monoprotic acid that can be synthesized by the reaction between CO and NH3 in the presence of hydronium ions. A proposed mechanism for the reaction consists of the three elementary steps shown below. Step 1: CH3 OH + CO → HCO2CH3 slow Step 2: HCO2CH3 + NH3 → HCONH2 + CH3 OH fast Step 3: HCONH2 + H3 O+ → HCOOH + NH4 + fast Overall reaction: CO + NH3 + H3 O+ → HCOOH + NH4 + ΔHrxn = −81 kJ/molrxn

Chemistry by OpenStax (2015-05-04)
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Chapter5: Thermochemistry
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Methanoic acid, HCOOH(aq) , is a monoprotic acid that can be synthesized by the reaction between CO and NH3 in the presence of hydronium ions. A proposed mechanism for the reaction consists of the three elementary steps shown below.
Step 1: CH3 OH + CO → HCO2CH3 slow
Step 2: HCO2CH3 + NH3 → HCONH2 + CH3 OH fast Step 3: HCONH2 + H3 O+ → HCOOH + NH4 + fast Overall reaction: CO + NH3 + H3 O+ → HCOOH + NH4 + ΔHrxn = −81 kJ/molrxn

(c) A student generates the following potential energy diagram
for the overall reaction. Is the student's diagram consistent with
the enthalpy of the overall reaction? Justify your answer.
HCOOH + NH4+
Potential
Energy
CO + NH3 + H3O+
Transcribed Image Text:(c) A student generates the following potential energy diagram for the overall reaction. Is the student's diagram consistent with the enthalpy of the overall reaction? Justify your answer. HCOOH + NH4+ Potential Energy CO + NH3 + H3O+
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