(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 160IP
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 160IP
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 160IP
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
- An organic compound (X) was treated with Bromine water. The orange red color of Bromine water was discharged. In another reaction, the same organic liquid (X) was treated with excess of Hydrogen in presence of Pt and a pure product (Y) was isolated. What is not true for the reactant (X) and product (Y)? Question 41 options: The reactant (X) may be an alkene or alkyne and product (Y) should be an alkane The reactant (X) should also decolorize the purple color of aqueous solution of KMnO4 The reactant (X) is an unsaturated compound The product (Y) will decolorize the purple color of aqueous solution of KMnO4 The product (Y) is a saturated compoundarrow_forward1. Which of the following formulas is incorrect?a. CaNO3b. MgSc. AlBr3d. Li2Oe. NaOH 2. Part of an organic molecule where most of its chemical reactions occur.a. Substrateb. Productc. Reactantsd. Functional Group 3. An acyclic unsaturated hydrocarbon that contains one or more carbon-carbon triple bonds. As the family name alkyne indicates the characteristics ending associated with a triple bond. It has a general formula of one triple bond is CnH2n-2.a. Alkenesb. Alkynesc. Aromatic compoundd. Cycloalkanearrow_forward7. kot The single bond between the carbonyl carbon and oxygen in the group. а. carboxyl Ob. carboxylate ion C. carboxylic acid Od. carboxylic acid anhydride e. carboxylic ester Of. condensation polymerization g. dimer h. ester i. esterification j. ester linkage Ok. fatty acid O1. saponificationarrow_forward
- It is a component of nylon 66. a. Phthalic acid b. Lauric acid O c. Benzoic acid d. Adipic acid e. Ethanoic acid Primary amine can be prepared by a. Reacting an alkyl halide with sodium azide. b. Reacting an amide with water under heat. O c. Reacting alkyl halide with NaCN followed by LiAlH4 in ether, then with water. O d. Reacting carboxylic acid with R-NH2 and NaBH4. Which of the following will give a positive reaction with Tollen's reagent? a. All of the above b. Butanone O c. 3-pentanone Od. Pentanal O e. Butanalarrow_forwardSubject-Chemistryarrow_forward38arrow_forward
- 1. Predict the products formed by hydration of the following alkanes. Example: 1-Hexene 1-Hexanol a. 2-Hexene = b. 2-Methyl-3-hexene = c. 2,2-Dimethyl-3-heptene = 2. Write an equation representing the reduction of the following aldehydes. Provide the structures and names for the reactants and products. Example: Butanal (a four-carbon aldehyde) +H, catalyst H. OH Butanal Hydrogen 1-Butanol ANSWER: a. Hexanal (a six-carbon aldehyde) b. 2-Methylbutanal (an aldehyde with a four-carbon parent chain)arrow_forwardWhich of the statements given below is false? A. It is the reaction reaction between an alkene and a halogen. B. The reaction of an olefin sample with bromine in carbon tetrachloride is an addition reaction. A. Octanol is soluble in ligroin, while it is insoluble in water. D. An olefin sample will decolorize Brominated water, while an alkane sample will cause the yellow orange color to remain. E. By determining the density of hexane and toluene, which are an example of a hydrocarbon, by pictogram, we can obtain information about their physical properties.arrow_forwardWHich statement is true? Statement 1: The ignition test for hydrocarbons is based on the sootiness of the flames they produce when burned. Unsaturated compounds produce black powdery or flaky substances consisting largely of amorphous carbon which is due to the incomplete combustion of organic matter. Statement 2: In the bromine test for unsaturation, the disappearance of the orange or red-brown color of bromine is due to the electrophilic addition reaction of bromine with the pi bond.arrow_forward
- Which of the following is FALSE about the absorbance of a compound? A. Solutions containing transition metals are not capable to absorb UV-Vis radiation. B. Organic solvents have effect on the absorbance of the compounds. C. Organic compounds with increasing conjugation will absorb UV-Vis radiation D. Saturated hydrocarbons will not give an absorbance reading.arrow_forwardBiphenyl consists of two benzene rings connected by asingle bond. When Cl atoms substitute for some of the H atoms,polychlorinated biphenyls (PCBs) are formed. There are over 200 different PCBs, but only six with one Cl on each ring. Draw these constitutional isomers.arrow_forwardC. Action of Sulphuric acid Add 5 drops of toluene to 4 drops of concentrated sulphuric acid. Is toluene soluble in the acid? Heat the vial while shaking in a water bath held at 65 - 70 °C for 3 minutes. Cool the vial and pour the contents into 2 mL of ice water. What substituted hydrocarbon has been prepared? Give the reaction equation. D. Action of Nitric Acid Prepare in a vial a mixture of 10 drops of concentrated sulphuric acid and 5 drops of concentrated nitric acid. When the temperature of the acid mixture is 55-60 °C, add 5 drops of toluene. Keep the mixture in a bath maintained at 55-60 °C for about 3 minutes, shaking it at short intervals. Repeat the test with cyclohexane. Which hydrocarbon reacts with nitric acid? Give the reaction equation.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
- General Chemistry - Standalone book (MindTap Cour...ChemistryISBN:9781305580343Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; DarrellPublisher:Cengage LearningPrinciples of Modern ChemistryChemistryISBN:9781305079113Author:David W. Oxtoby, H. Pat Gillis, Laurie J. ButlerPublisher:Cengage LearningIntroductory Chemistry: An Active Learning Approa...ChemistryISBN:9781305079250Author:Mark S. Cracolice, Ed PetersPublisher:Cengage Learning