Wine goes bad soon after opening because the ethanol ch3ch2oh in it reacts with oxygen gas o2 from the air to form water h2o and acetic acid ch3cooh , the main ingredient of vinegar. what mass of acetic acid is produced by the reaction of 7.0g of oxygen gas?

4.3 g

Explanation:  

We know we will need a balanced equation with masses and molar masses, so let’s gather all the information in one place.  

M_r:               60.05      32.00

                 CH₃CH₂OH + 3O₂ ⟶ 2CO₂ + 3H₂O

Mass/g:                             7.0  

1. Calculate the moles of O₂

Moles O₂ = 7.0 × 1/32.00  

Moles O₂ = 0.219 mol O₂  

2. Calculate the moles of CH₃CH₂OH

The molar ratio is 1 mol CH₃CH₂OH:3 mol O₂  

Moles of CH₃CH₂OH = 0.219 × 1/3  

Moles of CH₃CH₂OH = 0.0729 mol CH₃CH₂OH

3. Calculate the mass of CH₃CH₂OH  

Mass of CH₃CH₂OH = 0.0729 × 60.05

Mass of CH₃CH₂OH = 4.4 g

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.