00:01
Hello students, in this question a compound containing carbon, hydrogen and oxygen undergo combustion and produces the given amount of carbon dioxide and water.
00:10
We have to find out the empirical formula of the given compound.
00:13
For that we have to find out the number of moles of carbon, hydrogen and oxygen present in the given compound.
00:19
For that first of all we are going to calculate the number of moles of carbon dioxide which is given by mass divided by molar mass.
00:26
Therefore the number of moles of carbon dioxide is given by 51 .1 into 10 to the power minus 3 divided by 40.
00:37
On dividing this we will get the number of moles will be equal to 1 .2775 into 10 to the power minus 3 moles.
00:48
So from this we can calculate the number of moles of the carbon.
00:52
So in carbon dioxide every one mole of the carbon dioxide consists of one mole of the carbon that is in 1 is to 1 ratio.
01:01
Therefore the number of moles of carbon is equal to number of moles of carbon dioxide is equal to 1 .2775 into 10 to the power minus 3 moles.
01:11
Using this we can find out the mass of the carbon dioxide in the given compound which is given by number of moles into molar mass of the carbon.
01:19
Substituting the values that is mass of the carbon in the given sample will be equal to 1 .2775 into 10 to the power minus 3 into 12.
01:30
On multiplying this we can find out the mass of the carbon will be equal to 15 .33 milligram.
01:40
Applying this and we can find out the mass of the hydrogen in the given compound.
01:45
For that we have to calculate the number of moles of the water which is given by mass of the water that is 17 .5 into 10 to the power minus 3 divided by the molar mass of the water 18.
01:57
On dividing this we will get the number of moles will be equal to 0 .972 into 10 to the power minus 3 moles.
02:05
From the statometry of the water we can find out that the hydrogen and the water are in 1 is to 2 ratio.
02:12
Therefore the number of moles of hydrogen will be equal to 2 into number of moles of the water...