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4 Methanol can be manufactured by the reaction of carbon dioxide with hydrogen. 3H2(g) + CO2(g)   CH3OH(g) + H2O(g) equation 4.1In this reaction, 49.0 kJ of energy are released when 3 moles of H2 react completely. This enthalpy change is called the enthalpy change of reaction, ΔHr.(a) Calculate the energy released when 1000dm3 of hydrogen, measured at room temperature and pressure, react completely with carbon dioxide.Give your answer to three significant figures.answer is 681my question is why divide by 3? the definition of e.c of reaction is the enthalpy changed accompanied with a reaction in the molar quantities expressed in the equation. yet dividing by 3 would give you the energy released per mole surely?
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corey7695
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4 Methanol can be manufactured by the reaction of carbon dioxide with hydrogen. 3H2(g) + CO2(g)   CH3OH(g) + H2O(g) equation 4.1In this reaction, 49.0 kJ of energy are released when 3 moles of H2 react completely. This enthalpy change is called the enthalpy change of reaction, ΔHr.(a) Calculate the energy released when 1000dm3 of hydrogen, measured at room temperature and pressure, react completely with carbon dioxide.Give your answer to three significant figures.answer is 681my question is why divide by 3? the definition of e.c of reaction is the enthalpy changed accompanied with a reaction in the molar quantities expressed in the equation. yet dividing by 3 would give you the energy released per mole surely?



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