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Diketahui data entalpi pembentukan standar: Nilai adalah ....

Diketahui data entalpi pembentukan standar:


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell C subscript 3 H subscript 8 open parentheses italic g close parentheses space increment H degree subscript f end cell equals cell negative sign 104 space kJ forward slash mol end cell row cell C O subscript 2 open parentheses italic g close parentheses space space increment H degree subscript f end cell equals cell negative sign 394 space kJ forward slash mol end cell row cell H subscript 2 O open parentheses italic g close parentheses space space increment H degree subscript f end cell equals cell negative sign 286 space kJ forward slash mol end cell end table end style  

Nilai begin mathsize 14px style increment H subscript reaksi end style begin mathsize 14px style C subscript 3 H subscript 8 open parentheses italic g close parentheses and S O subscript 2 open parentheses italic g close parentheses yields 3 C O subscript 2 open parentheses italic g close parentheses and 4 H subscript 2 O open parentheses italic g close parentheses end style adalah ....

  1. – 1.034 kJundefined 

  2. – 1.121 kJundefined 

  3. – 1.134 kJundefined 

  4. – 2.222 kJundefined 

  5. – 2.232 kJundefined 

Jawaban:

Reaksi yang diminta adalah:

begin mathsize 14px style C subscript 3 H subscript 8 open parentheses italic g close parentheses and O subscript 2 open parentheses italic g close parentheses yields 3 C O subscript 2 open parentheses italic g close parentheses and 4 H subscript 2 O open parentheses italic g close parentheses end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell increment H subscript reaksi end cell equals cell begin inline style sum with blank below end style increment H subscript produk minus sign begin inline style sum with blank below end style increment H subscript reaktan end cell row cell increment H subscript reaksi end cell equals cell open parentheses 3 increment H subscript f superscript degree C O subscript 2 plus 4 increment H subscript f superscript degree H subscript 2 O close parentheses minus sign open parentheses increment H subscript f superscript degree C subscript 3 H subscript 8 plus increment H subscript f superscript degree O subscript 2 close parentheses end cell row blank equals cell open parentheses open parentheses 3 cross times left parenthesis minus sign 394 close parentheses plus left parenthesis 4 cross times left parenthesis minus sign 286 right parenthesis close parentheses minus sign left parenthesis minus sign 104 plus 0 right parenthesis space kJ end cell row blank equals cell left parenthesis left parenthesis minus sign 1182 minus sign 1144 right parenthesis plus 104 right parenthesis space kJ end cell row blank equals cell negative sign 2222 space kJ end cell end table end style 

Jadi, jawaban yang benar adalah D

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