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Diketahui △Hf∘​C4​H10​=−126,5kJ/mol, △Hf∘​CO2​=−393,5kJ/mol dan△Hf∘​H2​O=−285,6kJ/mol. Tentukan perubahan entalpi pada pembakaran 11,6 gram C4​H10​.

Pertanyaan

Diketahui increment H subscript f degree C subscript 4 H subscript 10 equals minus sign 126 comma 5 kJ forward slash mol, increment H subscript f degree C O subscript 2 equals minus sign 393 comma 5 kJ forward slash mol danincrement H subscript f degree H subscript 2 O equals minus sign 285 comma 6 kJ forward slash mol. Tentukan perubahan entalpi pada pembakaran 11 comma 6 space gram space C subscript 4 H subscript 10.

I. Solichah

Master Teacher

Jawaban terverifikasi

Jawaban

 perubahan entalpi pada pembakaran 11 comma 6 space gram space C subscript 4 H subscript 10 adalah negative sign 575 comma 1 space kJ forward slash mol.

Pembahasan

Perubahan entalpi suatu reaksi dapat juga ditentukan melalui data perubahan entalpi pembentukan standar reaktan dan produknya, yaitu dari reaktan selisih harga increment H subscript f degree reaktan dan increment H subscript f degree produk.


increment H equals sum increment H subscript f degree space hasil space reaksi minus sign sum increment H subscript f degree pereaksi


Reaksi pembakaran C subscript 2 H subscript 10:


C subscript 4 H subscript 10 open parentheses italic a italic q close parentheses plus begin inline style 13 over 2 end style O subscript 2 open parentheses italic g close parentheses yields 4 C O subscript 2 open parentheses italic g close parentheses and 5 H subscript 2 O open parentheses italic l close parentheses


Menghitung nilai perubahan entalpi:


table attributes columnalign right center left columnspacing 0px end attributes row cell increment H end cell equals cell sum increment H subscript f degree space hasil space reaksi minus sign sum increment H subscript f degree pereaksi end cell row blank equals cell open curly brackets left parenthesis 4 cross times ΔH subscript f degree space C O subscript 2 right parenthesis plus left parenthesis 5 cross times ΔH subscript f degree space H subscript 2 O right parenthesis close curly brackets minus sign open curly brackets ΔH subscript f degree space C subscript 4 H subscript 10 and ΔH subscript f degree space begin inline style 13 over 2 end style O subscript 2 close curly brackets end cell row blank equals cell open curly brackets 4 cross times left parenthesis minus sign 393 comma 5 space kJ forward slash mol right parenthesis right parenthesis plus left parenthesis 5 cross times left parenthesis minus sign 285 comma 6 space kJ forward slash mol right parenthesis close curly brackets minus sign open curly brackets negative sign 126 comma 5 space kJ forward slash mol plus 0 close curly brackets end cell row blank equals cell left parenthesis minus sign 3002 space kJ forward slash mol right parenthesis plus 126 comma 5 space kJ forward slash mol end cell row blank equals cell negative sign 2875 comma 5 space kJ forward slash mol end cell end table 


Menghitung jumlah mol C subscript 4 H subscript 10:


table attributes columnalign right center left columnspacing 0px end attributes row cell M subscript r space C subscript 4 H subscript 10 end cell equals cell left parenthesis 4 cross times A subscript r space C right parenthesis plus left parenthesis 10 cross times A subscript r space H right parenthesis end cell row blank equals cell left parenthesis 4 cross times 12 right parenthesis plus left parenthesis 10 cross times 1 right parenthesis space space space space space space space space space space space space space space space space space end cell row blank equals cell 48 plus 10 space space space space space space space space space space space space space space space space space end cell row blank equals cell space 58 end cell row blank blank blank row cell n space C subscript 4 H subscript 10 end cell equals cell massa over M subscript r space end cell row blank equals cell fraction numerator 11 comma 6 space g over denominator 58 end fraction end cell row blank equals cell 0.2 space mol end cell end table


Menghitung perubahan entalpi pada pembakaran:


table attributes columnalign right center left columnspacing 0px end attributes row cell ΔH subscript c degree end cell equals cell mol space cross times ΔH space space space space space space space space end cell row blank equals cell 0 comma 2 space mol cross times left parenthesis minus sign 2875 comma 5 space kJ forward slash mol right parenthesis space space space space space space space space end cell row blank equals cell negative sign 575 comma 1 space kJ forward slash mol end cell end table 


Jadi, perubahan entalpi pada pembakaran 11 comma 6 space gram space C subscript 4 H subscript 10 adalah negative sign 575 comma 1 space kJ forward slash mol.

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