Respuesta :
Answer:
The answer to your question is empirical formula = CH
molecular formula = C₆H₆
Explanation:
Data
Carbon 92.2%
Hydrogen 7.76%
Formula mass = 78.1 g
Process
1.- Express the percents as grams
Carbon 92.2 g
Hydrogen 7.76 g
2.- Convert the grams to moles
Carbon 12 g ---------------- 1 mol
92.2 g ------------- x
x = (92.2 x 1)/12
x = 7.68 moles
Hydrogen 1 g ------------------ 1 mol
7.76 g ------------- x
x = 7.76 moles
3.- Divide by the lowest number of moles
Carbon 7.68 / 7.68 = 1
Hydrogen 7.76 / 7.68 = 1.01
4.- Write the empirical formula
CH
5.- Calculate the molecular weight of the empirical formula
CH = 12 + 1 = 13
6.- Divide the molecular weight by the molecular weight of the empirical formula
78.1 / 13 = 6
7.- Write the molecular formula
6(CH) = C₆H₆
The empirical formula of the compound is CH. The molecular formula of the compound is [tex]\rm \bold C_6H_6[/tex]
A molecular formula has been the one that represents the exact number of atoms in a compound. The empirical formula has been able to represent the whole number ratio of atoms present in a compound.
The given compound has 92.2% Carbon and 7.76% Hydrogen. The weight will be:
Carbon = 92.2 g
Hydrogen = 7.76 g
From the weight, the moles of elements in the compound can be calculated.
Moles = [tex]\rm \dfrac{weight}{molecular\;weight}[/tex]
Moles of carbon = [tex]\rm \dfrac{92.2}{12}[/tex]
Moles of carbon = 7.76 moles
Moles of hydrogen = weight of hydrogen
Moles of hydrogen = 7.76 moles
For the empirical formula, divide the moles of each element to the nearest mole number;
Carbon = [tex]\rm \dfrac{7.76}{7.76}[/tex]
Carbon = 1
Hydrogen = [tex]\rm \dfrac{7.76}{7.76}[/tex]
Hydrogen = 1
Thus, the empirical formula of the compound will be CH.
For finding the molecular formula, the molecular weight from the empirical formula has been divided with the molecular weight of the compound to find the number of atoms.
Molecular weight of empirical formula = weight of carbon + weight of hydrogen
Molecular weight of empirical formula = 12 + 1
Molecular weight of empirical formula = 13 grams
Molecular mass of compound = 78.1 grams.
Number of atoms of each element = [tex]\rm \dfrac{78.1}{13}[/tex]
Number of atoms of each element = 6
Thus, the molecular formula of the compound is [tex]\rm C_6H_6[/tex].
For more information about the molecular and empirical formula, refer to the link:
https://brainly.com/question/14425592
