What is the ratio of molecules in: ch4 + 2o2 -> co2 + 2h2o

1:2:1:2

Explanation:

A molecule is made up of aggregates of small particles called atoms.

                   CH₄ + 2O₂ → CO₂ + 2H₂O

From the reaction above we have: 1 molecule of methane CH₄ reacting with 2 molecules of oxygen gas O₂ to produce 1 molecule of carbon dioxide gas CO₂ and 2 molecules of H₂O:

                   CH₄ + 2O₂ → CO₂ + 2H₂O

                      1    :     2   :     1      :     2    

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.