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A coal sample gave the following analysis by weight, Carbon 81.11 per cent, Hydrogen 1.91 per cent, Oxygen 1.73 per cent, the remainder being incombustible.

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A coal sample gave the following analysis by weight, Carbon 81.11 per cent, Hydrogen 1.91 per cent, Oxygen 1.73 per cent, the remainder being incombustible. For 90% excess air , determine actual weight of air required per kg of coal. Round your answer to two decimal places

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