
(a)
Interpretation: The empirical formula and the molecular formula of the given helicene are to be calculated. The balanced
Concept introduction: Helicines are defined as the polycyclic
To determine: The empirical formula of the given helicene.
(a)

Answer to Problem 174IP
Answer
The empirical formula of the given helicene is
Explanation of Solution
Explanation
The empirical formula of the given helicene is
Helicene is an aromatic compound so it must contain carbon and hydrogen atoms.
Given
Weight of
Weight of compound is
The weight of carbon is calculated by using the formula,
The molar mass of carbon is
The molar mass of carbon dioxide is
Substitute the value of weight of
The weight of carbon is
Therefore the weight of hydrogen is calculated as,
Therefore the number of moles of carbon and hydrogen is calculated by the formula,
Substitute the value of the given mass and the molar mass, to calculate the number of moles of carbon and hydrogen in the above equation.
For carbon,
For hydrogen,
The calculated values are divided by the smallest number of moles to determine the simplest whole number ratio of moles of each constituent.
For carbon
For hydrogen
By multiplying each with 3 we get the whole number as,
For carbon
For hydrogen
Hence, the empirical formula of the compound is
(b)
Interpretation: The empirical formula and the molecular formula of the given helicene are to be calculated. The balanced chemical reaction for the combustion of helicene is to be stated.
Concept introduction: Helicines are defined as the polycyclic aromatic compounds in which the aromatic ring is annulated to provide helically shaped molecule. The molecular formula of any organic compound is determined by using empirical formula when the percent of each element is given in the compound.
To determine: The molecular formula of the given helicene.
(b)

Answer to Problem 174IP
Answer
The molecular formula of the given helicene is
Explanation of Solution
Explanation
The molecular formula of the given helicene is
Given
Molality is
Weight of solvent is
Weight of solute is
Therefore the molecular weight of solute is calculated by the given expression.
Substitute the values of weight of solute, molality and weight of solvent in the above expression.
Now, The empirical mass of
Substitute the value of molecular and empirical weight in the above expression.
Therefore the molecular formula is calculated as,
Hence, the molecular formula is
(c)
Interpretation: The empirical formula and the molecular formula of the given helicene are to be calculated. The balanced chemical reaction for the combustion of helicene is to be stated.
Concept introduction: Helicines are defined as the polycyclic aromatic compounds in which the aromatic ring is annulated to provide helically shaped molecule. The molecular formula of any organic compound is determined by using empirical formula when the percent of each element is given in the compound.
To determine: The balanced chemical reaction for the combustion of helicene.
(c)

Answer to Problem 174IP
Answer
The balanced chemical reaction for the combustion of helicene is,
Explanation of Solution
Explanation
The balanced chemical reaction for the combustion of helicene is shown below.
The balanced reaction for the combustion of helicene is,
Want to see more full solutions like this?
Chapter 22 Solutions
Chemistry
- Determine if the following salt is neutral, acidic or basic. If acidic or basic, write the appropriate equilibrium equation for the acid or base that exists when the salt is dissolved in aqueous solution. If neutral, simply write only NR. Be sure to include the proper phases for all species within the reaction LiNO3arrow_forwardAn unknown weak acid with a concentration of 0.410 M has a pH of 5.600. What is the Ka of the weak acid?arrow_forward(racemic) 19.84 Using your reaction roadmaps as a guide, show how to convert 2-oxepanone and ethanol into 1-cyclopentenecarbaldehyde. You must use 2-oxepanone as the source of all carbon atoms in the target molecule. Show all reagents and all molecules synthesized along the way. & + EtOH H 2-Oxepanone 1-Cyclopentenecarbaldehydearrow_forward
- R₂ R₁ R₁ a R Rg Nu R₂ Rg R₁ R R₁₂ R3 R R Nu enolate forming R₁ R B-Alkylated carbonyl species or amines Cyclic B-Ketoester R₁₁ HOB R R₁B R R₁₂ B-Hydroxy carbonyl R diester R2 R3 R₁ RB OR R₂ 0 aB-Unsaturated carbonyl NaOR Aldol HOR reaction 1) LDA 2) R-X 3) H₂O/H₂O ketone, aldehyde 1) 2°-amine 2) acid chloride 3) H₂O'/H₂O 0 O R₁ R₁ R R₁ R₁₂ Alkylated a-carbon R₁ H.C R₁ H.C Alkylated methyl ketone acetoacetic ester B-Ketoester ester R₁ HO R₂ R B-Dicarbonyl HO Alkylated carboxylic acid malonic ester Write the reagents required to bring about each reaction next to the arrows shown. Next, record any regiochemistry or stereochemistry considerations relevant to the reaction. You should also record any key aspects of the mechanism, such as forma- tion of an important intermediate, as a helpful reminder. You may want to keep track of all reactions that make carbon-carbon bonds, because these help you build large molecules from smaller fragments. This especially applies to the reactions in…arrow_forwardProvide the reasonable steps to achieve the following synthesis.arrow_forwardIdentify which compound is more acidic. Justify your choice.arrow_forward
- Provide the reasonable steps to achieve the following synthesis.arrow_forwardWhen anisole is treated with excess bromine, the reaction gives a product which shows two singlets in 1H NMR. Draw the product.arrow_forward(ii) Draw a reasonable mechanism for the following reaction: CI NaOH heat OH (hint: SNAr Reaction) :arrow_forward
- ChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistry: An Atoms First ApproachChemistryISBN:9781305079243Author:Steven S. Zumdahl, Susan A. ZumdahlPublisher:Cengage Learning
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage LearningChemistry: Principles and ReactionsChemistryISBN:9781305079373Author:William L. Masterton, Cecile N. HurleyPublisher:Cengage LearningChemistry: Principles and PracticeChemistryISBN:9780534420123Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward MercerPublisher:Cengage Learning





