Balance the following reaction. a coefficient of "1" is understood. choose option "blank" for the correct answer if the coefficient is "1."

ch3oh + o2 → co2 + h2o

Balanced chemical reaction:

1) CH₃OH + 3/2O₂ → CO₂ + 2H₂O or

2) 2CH₃OH + 3O₂ → 2CO₂ + 4H₂O.

Number of atoms must be the same on left and right side of balanced chemical reaction according to the law of conservation of mass or principle of mass conservation.

1) There are four hydrogen atoms, one carbon atom, four oxygen atoms in this chemical reaction.

2) There are eight hydrogen atoms, two carbon atoms, eight oxygen atoms in this chemical reaction.

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the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.