This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
Study the information in the table below and answer the questions that follow. i) Write the general formula of the hydrocarbons in the table.

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Huu hapa ni utatuzi wa swali lako la 18 (i):
18) Jifunze habari katika jedwali hapa chini na ujibu maswali yanayofuata.
| Number of carbon atoms per molecule | Relative molecular mass of the hydrocarbon | |-------------------------------------|--------------------------------------------| | 2 | 28 | | 3 | 42 | | 4 | 56 |
Tunajua kwamba: Relative atomic mass ya Carbon (C) = 12 Relative atomic mass ya Hydrogen (H) = 1
i) Andika fomula ya jumla ya haidrokaboni kwenye jedwali.
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Step 1: Pata fomula ya molekuli kwa kila haidrokaboni. Kwa haidrokaboni yenye atomi za kaboni na atomi za hidrojeni, fomula ya molekuli ni . Uzito wa molekuli ni .
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Kwa (uzito wa molekuli = 28): Fomula ya molekuli ni .
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Kwa (uzito wa molekuli = 42): Fomula ya molekuli ni .
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Kwa (uzito wa molekuli = 56): Fomula ya molekuli ni .
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Step 2: Tambua uhusiano kati ya idadi ya atomi za kaboni () na hidrojeni (). Kutoka kwa fomula za molekuli zilizopatikana: Kwa , (yaani, ). Kwa , (yaani, ). Kwa , (yaani, ). Uhusiano ni kwamba idadi ya atomi za hidrojeni () ni mara mbili ya idadi ya atomi za kaboni ().
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Step 3: Andika fomula ya jumla. Kutokana na uhusiano , fomula ya jumla ya haidrokaboni hizi ni . Fomula ya jumla ya haidrokaboni kwenye jedwali ni .
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Huu hapa ni utatuzi wa swali lako la 18 (i): 18) Jifunze habari katika jedwali hapa chini na ujibu maswali yanayofuata.