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    Hello im doing an hnc in engineering and for one of my assignments i need to answer these 2 questions but im completely baffled. Any help would be ridiculously appreciated.

    Calculate the mass air / fuel ratio for stoichiometric combustion of aliquid fuel containing 70% w/wcarbon and 30% w/w hydrogen

    Calculate the calorific value and the volume air / fuel ratio for stoichiometric combustion of a gas with 79%v/v methane and 21% v/v butane.
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