Mae llosgnwy, neu methan, yn nwy sy'n hydrocarbon symlaf ac a ddynodir gan y fformiwla gemegol CH4.
 | |
| Enghraifft o'r canlynol | math o endid cemegol  |
|---|---|
| Math | hydrocarbon aliffatig biogenig, Alcan, grŵp 14 o hydridau |
| Màs | 16.031 uned Dalton |
| Fformiwla gemegol | Ch₄ |
| Dyddiad darganfod | 1777 |
| Yn cynnwys | carbon, hydrogen |
 Ffeiliau perthnasol ar Gomin Wicimedia | |
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