Air contains 21% of oxygen by weight. What weight of air is required to burn 50 grams of coal which contains only 50% combustible material?

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317 g

158.5 g

200 g

634 g

answer is A.

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Detailed Solution

weight of coal = 50gramspercentage of Combustible material in coal = 50% weight % of oxygen in air = 21% weight of air required = 317g

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