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When a candle burns the reaction is C25H52 + 38 O2 → 25 CO2 + 26 H2O. So it seems equal at both sides. But isn't there any light and heat (low elektromagnetic waves) produced. So how many Joule is produced of light of each candle molecule?

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  • $\begingroup$ It is not possible to deduce a value from this information. $\endgroup$ – user1420303 Apr 8 '16 at 12:18
  • $\begingroup$ Couldn't there be made an aproximation or what is needed more to know to get a value? $\endgroup$ – Marijn Apr 8 '16 at 12:54
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    $\begingroup$ An ordinary candle has a luminous intenity of about 1 cd (candela). You can convert that to a power (assuming a median wavelenght), multiply it with the time your candle burns, and compare with the delta H in your reaction. $\endgroup$ – Karl Apr 8 '16 at 14:10
  • $\begingroup$ See How to Find the Molar Heat of a Combustion Candle for a detailed explanation and answer. $\endgroup$ – Todd Minehardt Apr 8 '16 at 18:26

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