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A carbohydrate was isolated from a sample of cow’s milk. The substance was found to have a molecular mass of 342. The unknown carbohydrate can be hydrolyzed to form two isomeric compounds, each with a molecular mass of 180. Using the Rule of Thirteen, determine a molecular formula and an index of hydrogen deficiency for the unknown and for the hydrolysis products. (Hint: Begin by solving the molecular formula for the 180-amu hydrolysis products. These products have one oxygen atom for every carbon atom in the molecular formula. The unknown is lactose. Look up its structure in The Merck Index and confirm its molecular formula.)
The Drug Enforcement Agency (DEA) confiscated a hallucinogenic substance during a drug raid. When the DEA chemists subjected the unknown hallucinogen to chemical analysis, they found that the substance had a molecular mass of 314. Elemental analysis revealed the presence of carbon and hydrogen only. Using the Rule of Thirteen, determine a molecular formula and an index of hydrogen deficiency for this substance. (Hint: The molecular formula of the unknown also contains two oxygen atoms. The unknown is tetrahydrocannabinol, the active constituent of marijuana. Look up the structure of tetrahydrocannabinol in The Merck Index and confirm its molecular formula.)
Explain why Mo(PMe3)5H2 is a dihydride (contains two separate H ligands), but Mo(CO)3(PR3)2(H2) contains the dihydrogen ligand (Me = methyl, R = isopropyl).
How many neighboring H-atoms are there to the OH group?
2. Write the line structural formula of the compounds. Circle and identify all functional groups present:
a. 3,4-dibromocyclohexanol
b. 2,3-dichloro-4-ethylhept-2-ene
c. 2-methylbutanoic acid
What is the bond angle of shchchoh
Calculate the enthalpy change for the production of one mole of dinitrogen
pentoxide gas from nitrogen gas and oxygen gas. Use the thermochemical equations
a., b., and c. Show all your work. Beside each equation write the changes you are
making to each equation, re-write the equations according to your changes. Your
answer must include a balanced thermochemical equation. Include a potential energy
diagram for your target equation. (5 marks)
a. 2H2(g) + O2(g) ® 2H2O(l) DH° = -572.0 kJ
b. . N2O5(g) + . H2O(l) ® HNO3(l) DH° = -38.5 kJ
c. !
" N2(g) + #
" O2(g) + !
" H2(g) ® HNO3(l) DH° = -174.0 kJ
What is the lewis structure of SHCHCHOH?
Local geometry of SHCHCHOH
All bond angles of SHCHCHOH
