Portmess Homework Solutions 46

# Portmess Homework Solutions 46 - 40 ALKANES Equations(1...

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Equations (1) and (2) are the combustion of hydrogen and acetylene, respectively. Equation (3) is the reverse of the combustion of ethylene, and its value of H ° is the negative of the heat of combustion of ethylene. The value of H ° for the hydrogenation of acetylene to ethane is equal to the sum of the two reactions just calculated: ( c ) We use the equations for the combustion of ethane, ethylene, and acetylene as shown. The value of H ° for reaction (1) is twice that for the combustion of ethylene because 2 mol of ethylene are involved. 2.37 ( a ) The hydrogen content increases in going from CH 3 C > CH to CH 3 CH ? CH 2 . The organic compound CH 3 C > CH is reduced. ( b ) Oxidation occurs because a C G O bond has replaced a C G H bond in going from starting material to product. ( c ) There are two carbon oxygen bonds in the starting material and four carbon oxygen bonds in the products. Oxidation occurs. ( d ) Although the oxidation state of carbon is unchanged in the process overall, reduction of the organic compound has occurred. Its hydrogen content has increased and its oxygen content has decreased.
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