Municipal solid waste buried in landfill sites undergoes anaerobic digestion, producing a gas mixture known as landfill gas that can be captured and used as fuel.
The pie chart below shows the composition of a sample of landfill gas.
a.[1]
Gas Y is the main combustible fuel gas in the landfill gas. What is the chemical name of Gas Y?
b.[1]
Calculate the percentage of Gas Y in the landfill gas sample.
c.[2]
Name two groups of microorganisms that are responsible for the decomposition of organic matter.
d.[2]
Explain how a temperature increase from 12 ∘C12\text{ }^\circ\text{C}12 ∘C to 37 ∘C37\text{ }^\circ\text{C}37 ∘C affects the rate of decay by these microorganisms.