Methanol is combusted to provide heat. The reaction and the enthalpy for the reaction are shown below.

CH ₃ OH(1) + 1.5O ₂ (g) ® CO ₂ (g) + 2H ₂ O (1) ΔH = -715 kJ

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This chemical reaction transfers heat from the system to the surroundings.

The enthalpy for 2CH ₃ OH(l) + 3O ₂ (g) ® 2CO ₂ (g) + 4H ₂ O(l) is – 1,430 kJ

The enthalpy for 2CH ₃ OH(l) + 3O ₂ (g) ® 2CO ₂ (g) + 4H ₂ O(l) is 1,430 kJ

This process is exothermic.

The enthalpy for 2CH ₃ OH(l) + 3O ₂ (g) ® 2CO ₂ (g) + 4H ₂ O(l) is – 715kJ

This process is endothermic.

This chemical reaction transfers heat from the surroundings to the system.

The enthalpy for 2CH ₃ OH(l) + 3O ₂ (g) ® 2CO ₂ (g) + 4H ₂ O(l) is 715kJ