25 g of an unknown hydrocarbon upon burning produces 88 g of and 9 g of . This unknown hydrocarbon contains:

Question

25 g of an unknown hydrocarbon upon burning produces 88 g of  and 9 g of . This unknown hydrocarbon contains:

Canvas Classes · Accepted Answer

Strategy:
 Use the mass of combustion products ( and water) to determine the absolute mass of Carbon and Hydrogen in the hydrocarbon sample.

Step 1: Calculate mass of Carbon
Molar mass .

Step 2: Calculate mass of Hydrogen
Molar mass .

Step 3: Verify total mass
Total mass . This matches the sample mass.

Note: If selecting from predefined options where (d) is tagged as correct in the key, the calculation itself leads to 24g C and 1g H.

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