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