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A sealed area known to have black damp has 18 O2...

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Mine Ventilation
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A sealed area known to have black damp has 18% O2, 2% CO2, and 78% N2. If fresh air has 21% O2, 0.03% CO2 and 78.97% N2, the percentage of black damp in the are is

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Correct Answer: Option B
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