Ocean acidification is the result of cars releasing
a. acid directly into the atmosphere
b. carbon dioxide that forms acid when it dissolves in water
c. sulphur dioxide that forms acid in the atmosphere
d. nitrogen oxides that form acid in the atmosphere

Answer is: b. carbon dioxide that forms acid when it dissolves in water.

Gasoline is a mixture of many different hydrocarbons: alkanes (paraffins), cycloalkanes and alkenes (olefins).

Reactio of gasoline combustion and forming carbon dioxide:

C₈H₁₈ + 25/2O₂ → 8CO₂ + 9H₂O.

Balanced chemical reaction of forming carbonic acid from carbon dioxide and water in the clouds: CO₂ + H₂O → H₂CO₃.

Fossil fuel combustion increases the acidity of rain.

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol