shniyacrawley1 shniyacrawley1

10-09-2017
Chemistry

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In this thermochemical reaction, what does the coefficient ½ represent?

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meerkat18 meerkat18

21-09-2017

A thermochemical reaction is a chemical reaction with an additional information of the heat of reaction. For example, this is the thermochemical reaction for the combustion of hydrogen gas:

H₂ (g) + 1/2 O₂ (g) → H₂O (l) ΔH = -285.8 kJ

The coefficient 1/2 represents the number of moles of O₂ needed to combust 1 mole of H₂ gas in order to yield one mole of water.

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