How much oxygen should be added with $12 g$ carbon to give $44 g$ carbon dioxide assuming complete combustion of carbon?

28 g

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30 g

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32 g

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34 g

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Solution

The correct option is C $32 g$
According to law of conservation of mass
Mass of carbon $+$ mass of oxygen $=$ Mass of carbon dioxide
$12 g + x = 44 g$
so mass of oxygen $= 32 g$

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