
At and 1 atmospheric pressure, of a hydrocarbon requires of for complete combustion and of is formed. Then, the formula of the hydrocarbon is:
A.
B.
C.
D.
Answer
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Hint: We all know that hydrocarbon is an organic compound which consists of carbon and hydrogen atoms in particular. Both of these atoms are bonded with covalent bonds. So, while solving the above question we need to consider different types of chemical reactions and try to balance the x and y components of a hydrocarbon.
Complete step by step answer:
As we all have studied there are different types of chemical reactions. So, let’s consider the general reaction to be
Now, according to the question let’s place the values of A, B, C, and D in the reaction.
Now, let’s write their chemical formulas
So, to balance the x of a hydrocarbon we have to balance the whole chemical equation.
The equation used:
In the question, they given that the hydrocarbon = , Oxygen = , Carbon dioxide =
According to the question let’s consider the reactants side to calculate the products mol value.
Firstly, we will take Hydrocarbon:
of the hydrocarbon = of produced which implies that
of the hydrocarbon = of produced
Thus,
So,
Therefore, we found the value of x.
Now, let’s consider for Oxygen:
ml of oxygen is required = produces x mL of
We can simplify this step by cross multiplication.
Here, we can substitute the value of x.
As , so the equation becomes
But according to the question we had to determine the chemical formula of a hydrocarbon. So, we will substitute the respective values of x and y in the formula to complete it.
Formula of hydrocarbon =
Hence, the formula of hydrocarbon becomes
Option D is the correct answer.
Note:
We must know that combustion analysis is a common analysis method for hydrocarbon. We can use this to analyze samples of unknown chemical formulas. It requires only milligrams of a sample. So we have to weigh the sample and then fully combust at a high temperature in the presence of excess oxygen, which produces carbon dioxide and water.
Complete step by step answer:
As we all have studied there are different types of chemical reactions. So, let’s consider the general reaction to be
Now, according to the question let’s place the values of A, B, C, and D in the reaction.
Now, let’s write their chemical formulas
So, to balance the x of a hydrocarbon we have to balance the whole chemical equation.
The equation used:
In the question, they given that the hydrocarbon =
According to the question let’s consider the reactants side to calculate the products mol value.
Firstly, we will take Hydrocarbon:
Thus,
So,
Therefore, we found the value of x.
Now, let’s consider for Oxygen:
We can simplify this step by cross multiplication.
Here, we can substitute the value of x.
As
But according to the question we had to determine the chemical formula of a hydrocarbon. So, we will substitute the respective values of x and y in the formula to complete it.
Formula of hydrocarbon =
Hence, the formula of hydrocarbon becomes
Note:
We must know that combustion analysis is a common analysis method for hydrocarbon. We can use this to analyze samples of unknown chemical formulas. It requires only milligrams of a sample. So we have to weigh the sample and then fully combust at a high temperature in the presence of excess oxygen, which produces carbon dioxide and water.
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