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