Ethane burns in oxygen to form CO_2 and H_2O according to the equation : 2C_2H_6 + 7O_2 rarr 4CO_2 + 6H_2O If 1250 cc of oxygen is burnt with 300 cc of ethane. Calculate : the volume of unused O_2.

Ethane burns in oxygen to form CO_2 and H_2O according to the equation

1.	Ethane burns in oxygen to form CO_2 and H_2O according to the equation : 2C_2H_6 + 7O_2 rarr 4CO_2 + 6H_2O If 1250 cc of oxygen is burnt with 300 cc of ethane. Calculate : the volume of unused O_2.
Answer» SOLUTION :The equation involved is `2C_2 H_6 + 7O_2to4CO_2 + 6H_2O` `2 " volumes " "" 4 " volumes "` This equation implies that under similar conditions 2 volumes of ethane (on BURNING completely), will give 4 volumes of `CO_2`. Since the conditions are similar in the given problem, 2.5 L of ethane will form `2.5 XX 4/2 = 5.0L " of " CO_2 " at " 27^@C` and 1 atm PRESSURE.