Which option correctly states the stoichiometric ratio for gasoline engines?

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Multiple Choice

Which option correctly states the stoichiometric ratio for gasoline engines?

Explanation:
The stoichiometric air–fuel ratio is the exact balance where all the fuel and oxygen can react completely with no excess of either side. For gasoline engines this balance is about 14.7 parts of air for every 1 part of fuel by mass. That 14.7:1 target is what the engine control system strives for around the operating temperature to achieve complete combustion and to keep the catalytic converter working efficiently. In practice, a little richer or leaner than this ratio can occur depending on fuel composition, temperature, and engine load, but 14.7:1 is the standard reference value.

The stoichiometric air–fuel ratio is the exact balance where all the fuel and oxygen can react completely with no excess of either side. For gasoline engines this balance is about 14.7 parts of air for every 1 part of fuel by mass. That 14.7:1 target is what the engine control system strives for around the operating temperature to achieve complete combustion and to keep the catalytic converter working efficiently. In practice, a little richer or leaner than this ratio can occur depending on fuel composition, temperature, and engine load, but 14.7:1 is the standard reference value.

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