To determine the volume of oxygen required for the complete combination of 12.5 cm^3 of ethene (C2H2), we need to use the stoichiometry of the balanced chemical equation.
The balanced equation provided is:
C2H2 + 3O2 ā 2H2O + 2CO2
From the equation, we can see that the ratio of oxygen to ethene is 3:1. This means that for every 1 volume of ethene, we need 3 volumes of oxygen.
Given that we have 12.5 cm^3 of ethene, we can calculate the volume of oxygen required as follows:
Volume of oxygen = (Volume of ethene) x (Volume ratio of oxygen to ethene)
Volume of oxygen = 12.5 cm^3 x 3
Volume of oxygen = 37.5 cm^3
Therefore, the volume of oxygen required for the complete combination of 12.5 cm^3 of ethene is 37.5 cm^3.