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A quantity of 12g of magnesium is burnt ...

A quantity of 12g of magnesium is burnt completely in air (`O_2 = 20%` and `N_2 = 80%` by volume). Which of the following is/are correct statement(s) regarding this combustion.
A) A minimum of 36g air is needed if all Mg is converted into MgO only
B) A minimum of 40g air is needed if all Mg is converted into MgO only
C) A minimum of 4.67g air is needed if all Mg is converted into `Mg_3N_2` only
D) If air is consumed completely, then the total mass of products formed is 17.14g

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