Standard enthalpies of reaction at 300 K and the corresponding thresholds of wavelength for the dissociation of gaseous methane into other atomic and molecular species in their ground states, except CH2 also in excited state.
| . | ΔrHo/kJ mol−1 . | λthreshold/ nm . | . |
|---|---|---|---|
| CH4 + hv → CH3 + H | 442 | 270.5 | (1a) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm CH}_{\rm 2} {\rm X} + {\rm H}_2$| | 466.5 | 256.4 | (1b) |
| |$\phantom{{\rm CH}_4 + hv}\to {\rm CH}_2 \;a + {\rm H}_2$| | 518.6 | 230.7 | (1c) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm CH}_2 \,{\rm X} + 2{\rm H}$| | 902.5 | 132.5 | (1d) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm CH} + {\rm H} + {\rm H}_{\rm 2}$| | 887 | 134.8 | (1e) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm CH} + 3{\rm H}$| | 1323 | 90.4 | (1f) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm C} + 2{\rm H}_2$| | 791.5 | 151.1 | (1g) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm C} + 4{\rm H}$| | 1664 | 71.9 | (1h) |
| . | ΔrHo/kJ mol−1 . | λthreshold/ nm . | . |
|---|---|---|---|
| CH4 + hv → CH3 + H | 442 | 270.5 | (1a) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm CH}_{\rm 2} {\rm X} + {\rm H}_2$| | 466.5 | 256.4 | (1b) |
| |$\phantom{{\rm CH}_4 + hv}\to {\rm CH}_2 \;a + {\rm H}_2$| | 518.6 | 230.7 | (1c) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm CH}_2 \,{\rm X} + 2{\rm H}$| | 902.5 | 132.5 | (1d) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm CH} + {\rm H} + {\rm H}_{\rm 2}$| | 887 | 134.8 | (1e) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm CH} + 3{\rm H}$| | 1323 | 90.4 | (1f) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm C} + 2{\rm H}_2$| | 791.5 | 151.1 | (1g) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm C} + 4{\rm H}$| | 1664 | 71.9 | (1h) |
Standard enthalpies of reaction at 300 K and the corresponding thresholds of wavelength for the dissociation of gaseous methane into other atomic and molecular species in their ground states, except CH2 also in excited state.
| . | ΔrHo/kJ mol−1 . | λthreshold/ nm . | . |
|---|---|---|---|
| CH4 + hv → CH3 + H | 442 | 270.5 | (1a) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm CH}_{\rm 2} {\rm X} + {\rm H}_2$| | 466.5 | 256.4 | (1b) |
| |$\phantom{{\rm CH}_4 + hv}\to {\rm CH}_2 \;a + {\rm H}_2$| | 518.6 | 230.7 | (1c) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm CH}_2 \,{\rm X} + 2{\rm H}$| | 902.5 | 132.5 | (1d) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm CH} + {\rm H} + {\rm H}_{\rm 2}$| | 887 | 134.8 | (1e) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm CH} + 3{\rm H}$| | 1323 | 90.4 | (1f) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm C} + 2{\rm H}_2$| | 791.5 | 151.1 | (1g) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm C} + 4{\rm H}$| | 1664 | 71.9 | (1h) |
| . | ΔrHo/kJ mol−1 . | λthreshold/ nm . | . |
|---|---|---|---|
| CH4 + hv → CH3 + H | 442 | 270.5 | (1a) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm CH}_{\rm 2} {\rm X} + {\rm H}_2$| | 466.5 | 256.4 | (1b) |
| |$\phantom{{\rm CH}_4 + hv}\to {\rm CH}_2 \;a + {\rm H}_2$| | 518.6 | 230.7 | (1c) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm CH}_2 \,{\rm X} + 2{\rm H}$| | 902.5 | 132.5 | (1d) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm CH} + {\rm H} + {\rm H}_{\rm 2}$| | 887 | 134.8 | (1e) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm CH} + 3{\rm H}$| | 1323 | 90.4 | (1f) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm C} + 2{\rm H}_2$| | 791.5 | 151.1 | (1g) |
| |$\phantom{{\rm CH}_4 + hv} \to {\rm C} + 4{\rm H}$| | 1664 | 71.9 | (1h) |
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