00:01
Hello everyone.
00:02
So for this question we have been given four different compounds and what we need to find is the compound that will have the highest vapor pressure among all of these.
00:11
So first let us calculate the molecular mass of each of the compounds so the first compound that is given to us in this compound we have two oxygen atoms now the molecule mass for oxygen is 16 and there are two atoms of oxygen so it will be 32 grams per mole plus hydrogen there are six hydrogen atoms total so it will be six oxygen atoms total so it will be six grams per mole and there are two carbon atoms so it will be 24 grams per mole so it will be equal to 62 grams per mole now for the second compound there is only one oxygen atom so 16 grams per mole of oxygen atom plus there are six hydrogen atoms and there are two carbon atoms so it will be equal to 24 grams per mole and the total will be 46 grams per mole next one we have again a single oxygen atom so 16 grams per mole there are 8 hydrogen atoms and there are 3 carbon atoms so it will be equal to 36 grams per mole so the total will be 60 grams and for the last one there is again one oxygen atom so 16 grams per mole plus there are hydrogen atoms that are 10 in number so 10 grams per mole of hydrogen plus there are 4 carbon atoms so it will be 48 grams per mole of carbon so it will be total of 74 grams now for vapor pressure we know that vapor pressure is inversely proportional to the boiling point of any substance.
01:45
And this boiling point of organic compounds is directly proportional to the molecular masses of these compounds.
01:51
So from this equation, we can say that lower the molecule mass of any compound, higher will be the vapor pressure.
01:59
So from the given options, we can see the lowest molecular mass is for the second compound, that is this ch3, cs2oh.
02:06
So this cs3, cs2oh, that is basically the ethanol, that is having the least molecular mass, having 46 grams per mole will have the lowest boiling point among all of these substances and thus the vapor pressure will be high...