4. The number of moles of CO2 molecule formed during combustion reaction of 2 mol of benzene in sufficient oxygen supply is

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Q. When

12 g

graphite is burnt in sufficient oxygen,

C O

as well as

C O_{2}

is formed. If the product contains

40

C O

and

60

C O_{2}

by mass and none of the reactant is left, what is the mass of oxygen gas used in combustion?

Calcium carbide is used for the artificial ripening of fruits. Actually, the fruit ripens because of the heat evolved while calcium carbide reacts with moisture. During the reaction, calcium hydroxide and acetylene gas is formed.

If 200 $c m^{3}$ of acetylene is formed from a certain mass of calcium carbide. Find the volume of oxygen required and carbon dioxide formed during the complete combustion. The combustion reaction can be represented as below:

$2 C_{2} H_{2} (g) + 5 O_{2} (g) \to 4 C O_{2} (g) + 2 H_{2} O (g)$