28.0 L of is produced on complete combustion of 16.8 L gaseous mixture of ethene and methane at and 1 atm. Heat evolved during the combustion process is kJ.

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Question

28.0 L of  is produced on complete combustion of 16.8 L gaseous mixture of ethene and methane at  and 1 atm. Heat evolved during the combustion process is  kJ.

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Canvas Classes · Accepted Answer

Strategy:
 Use mole ratios and the total volume to set up linear equations for the gaseous components. Calculate the heat evolved using the molar combustion enthalpies.

Step 1: Determine moles of gases
Assume ideal behavior at standard conditions ( at ).
Total moles .
Let  and .
 ... (i)

Step 2: Analyze  production

Total  moles  ... (ii)

Step 3: Solve for  and 
(ii) - (i): .
.

Step 4: Calculate heat evolved ()

.
Rounding to nearest integer gives  or  depending on molar volume used. (Using

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