Acetylene (C2H2) gas at 25C is burned in a steady flow combustion chamber with 30 percent excess air that also enters at 25C. The products leave the combustion chamber at 1520 K. Assuming combustion is complete and happens at 1 atm, determine the air fuel ratio and the heat transfer rate (KJ/Kmol of fuel).

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Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.