2-methylbutane and 2,2-dimethyIpropane are isomeric hydrocarbons with the molecular formula C5H12 a)In an experiment to find the standard enthalpy of combustion (AH.") of both compounds, the temperature of 200 g of water was raised by 30 °C. The mass of 2-methylbutane burned was found to be 0.626 g and the volume of 2,2-dimethylpropane burned was 171 cm'. i)Calculate (in kJ) the heat given out by the 2-methylbutane in the experiment. ii)Use the data to calculate the standard enthalpy of combustion of 2-methylbutane and give your answer to 3 significant figures. iii)Calculate the standard enthalpy of combustion of 2,2-dimethyIpropane.
2-methylbutane and 2,2-dimethyIpropane are isomeric hydrocarbons with the molecular formula C5H12 a)In an experiment to find the standard enthalpy of combustion (AH.") of both compounds, the temperature of 200 g of water was raised by 30 °C. The mass of 2-methylbutane burned was found to be 0.626 g and the volume of 2,2-dimethylpropane burned was 171 cm'. i)Calculate (in kJ) the heat given out by the 2-methylbutane in the experiment. ii)Use the data to calculate the standard enthalpy of combustion of 2-methylbutane and give your answer to 3 significant figures. iii)Calculate the standard enthalpy of combustion of 2,2-dimethyIpropane.
Chemistry: Matter and Change
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Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
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Chapter15: Energy And Chemical Change
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Problem 112A: sample of natural gas is analyzed and found to be88.4% methane (CH4) and 11.6% ethane (C2H6) bymass....
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Question
2-methylbutane and 2,2-dimethyIpropane are isomeric hydrocarbons with the molecular formula C5H12
a)In an experiment to find the standard enthalpy of combustion (AH.") of both compounds, the
temperature of 200 g of water was raised by 30 °C. The mass of 2-methylbutane burned was
found to be 0.626 g and the volume of 2,2-dimethylpropane burned was 171 cm'.
i)Calculate (in kJ) the heat given out by the 2-methylbutane in the experiment.
ii)Use the data to calculate the standard enthalpy of combustion of 2-methylbutane and
give your answer to 3 significant figures.
iii)Calculate the standard enthalpy of combustion of 2,2-dimethyIpropane.
b)Construct a Hess's cycle to find the standard enthalpy change of reaction for the conversion
of 2-methylbutane to 2,2-dimethyIpropane. Use the two values for the standard enthalpies of
combustion to calculate the enthalpy change for the reaction:
2-methylbutane -> 2,2-dimethylpropane
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