Volume percentage
Volume percentage
o
Volume percentage can be defined as the ratio of Volume of the component of the solution and total mass of the solution multiplied by 100 %.
o Mathematically, Volume % of a component
= o Volume percentage of ethanol in a 100 mL solution containing 10 mL of ethanol dissolved in water is 10 %.
Mass % of ethanol
=
At this concentration the antifreeze lowers the freezing point of water to 255.4K or – 17.6 ° C.
Problem:
Ami took a 20 cm 3 mixture of CO, CH4 and He gases and exploded it by an electric discharge at room temperature with excess of oxygen. The volume initially contracted to 13.0 cm 3. Then it further contracted to 14.0 cm 3 when the residual gas is treated with KOH solution. Find out the consumption of gaseous mixture in terms of volume percentage.
Solution: Take V1 = Partial volumes of CO
V2 = Partial volumes of CH4
V3 = Partial volumes of He
V1 + V2 + V3 = 20.0 cm 3
The equation for combustion is as follows: CO + ½ O2-- > CO2