Neutral and ionic heats of formation; their measurement and reliability for ketenes
Conference
·
OSTI ID:210572
- Univ. of Ottawa, Ontario (Canada)
- McMaster Univ., Hamilton, Ontario (Canada)
The heat of formation, {Delta}{sub f}H{degrees}, of ketene, CH{sub 2}CO, is an important thermochemical quantity, leading to {Delta}{sub f}H{degrees} estimates for many substituted ketenes, R{sub 1}R{sub 2}CCO. {Delta}{sub f}H{degrees}[CH{sub 2}CO] was measured in 1971 from the heat of the reaction CH{sub 2}CO(g) + NaOH(aq) {r_arrow} CH{sub 3}COONa(aq) and the resulting value of -11.4 {+-} 0.4 kcal mol{sup -1} has been widely quoted. There are no data for methyl or dimethyl ketenes and only the former has been investigated by ab initio MO theory, {Delta}{sub f}H{degrees}[CH{sub 3}CHCO](calc) = -15.6 {+-} 2.4 kcal mol{sup -1}. The authors present measurements allowing calculation of the heat of formation of these ketenes and there corresponding ions.
- OSTI ID:
- 210572
- Report Number(s):
- CONF-9505261--
- Country of Publication:
- United States
- Language:
- English
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