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Q: molar heats of combustion
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Can someone please explain and rank the molar heats of combustion attached?
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- Following are heats of combustion per mole for methane, propane, and 2,2,4-trimeth-ylpentane. Each is a major source of energy. On a gram-for-gram basis, which of these hydrocarbons is the best source of heat energy?2- Of the following substances, the one with the lowest vapor pressure at 0 ° C is: A) CH3COCH3 AcetoneB) CH2Cl2 ( DICLOMETHANE)C) CH4 (METHANE)D) CH3CH2OH( ETHANOL)E) (CH3CH2)2O ETHER ETHYLC2H5OH combustion releases 1200 kJ/mol. How many giving off of C2H5OH is to be burned to generate 6200 kJ energy?
- Draw both chair confirmations of the substituted cyclohexane drawn below. Be certain to actually do a ring flip. Also be certain to very clearly distinguish axial from equatorial positions. Then circle the more stable conformation. Draw a planar representation of a stereoisomers which would have a higher heat of combustion and lower heat of combustion.Which would you predict to have the larger (more negative) heat of combustion, cis-1,4-dimethylcyclohexane or trans-1,4-dimethylcyclohexane?In each of the following groups of compounds, identify the one with the largest heat of combustion and the one with the smallest. (a) Hexane, heptane, octane (b) 2-Methylpropane, pentane, 2-methylbutane (c) 2-Methylbutane, 2-methylpentane, 2,2-dimethylpropane (d) Pentane, 3-methylpentane, 3,3-dimethylpentane (e) Ethylcyclopentane, ethylcyclohexane, ethylcycloheptane
- Rank the following compounds according to heat of combustion with 1 being greatest exothermicity and 4 least exothermicity of combustion.The heats of combustion (−∆H°) of heptane and 3,3-dimethypentane are 4,817 and 4,809 kJ/mol, respectively. Which statement is true? A. Heptane is 8 kJ/mol more stable then 3,3-dimethylpentane. B. 3,3-Dimethylpentane is 8 kJ/mol more stable than heptane C. Stabilities cannot be compared since they are not isomers. D. Stabilities cannot be compared since they give different combustion products.Draw the most stable conformation of (a) ethylcyclohexane
- Arrange the following compounds in order of decreasing heat of combustion: pentane, 2-methylbutane, 2,2-dimethylpropane, hexane.Why is this a cyclohexane ring when there is only one double bond?The heat of combustion of cyclononane is 5586 kJ/mol (1335 kcal/mol). Calculate the ring strain per CH2 group and the total ring strain of cyclononane. Which compound has more ring strain, cyclononane or cycloheptane?
