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Nilai △H2​ sebesar...

Pertanyaan

Nilai begin mathsize 14px style increment H subscript 2 end style sebesar...

I. Yassa

Master Teacher

Mahasiswa/Alumni Universitas Negeri Surabaya

Jawaban terverifikasi

Jawaban

nilai dari begin mathsize 14px style increment H subscript 2 end style adalah begin mathsize 14px style negative sign 1.400 space kJ end style 

Pembahasan

Reaksi yang terjadi pada bagan adalah:


begin mathsize 14px style C subscript 2 H subscript 2 O open parentheses italic g close parentheses and O subscript 2 open parentheses italic g close parentheses yields C subscript 2 H subscript 4 O open parentheses italic g close parentheses and H subscript 2 open parentheses italic g close parentheses and begin inline style 7 over 2 end style O subscript 2 open parentheses italic g close parentheses space increment H subscript 1 equals space plus 138 space kJ C subscript 2 H subscript 2 O open parentheses italic g close parentheses and O subscript 2 open parentheses italic g close parentheses yields 2 C O subscript 2 open parentheses italic g close parentheses and 3 H subscript 2 O open parentheses italic g close parentheses space increment H subscript 4 equals space minus sign 1.548 space kJ 2 C O subscript 2 open parentheses italic g close parentheses and 2 H subscript 2 O open parentheses italic g close parentheses and H subscript 2 open parentheses italic g close parentheses yields 2 C O subscript 2 open parentheses italic g close parentheses and 3 H subscript 2 O open parentheses italic g close parentheses space increment H subscript 3 equals space minus sign 286 space kJ end style 


Reaksi yang ditanyakan adalah:


begin mathsize 14px style C subscript 2 H subscript 4 O open parentheses italic g close parentheses and H subscript 2 open parentheses italic g close parentheses plus begin inline style 7 over 2 end style O subscript 2 open parentheses italic g close parentheses yields 2 C O subscript 2 open parentheses italic g close parentheses and 2 H subscript 2 O open parentheses italic g close parentheses and H subscript 2 open parentheses g close parentheses space increment H subscript 2 equals end style 


Untuk menentukan nilai begin mathsize 14px style increment H subscript 2 end style perlu menyesuaikan reaksi-reaksi yang diketahui dengan reaksi yang ditanyakan.


begin mathsize 14px style C subscript 2 H subscript 4 O open parentheses italic g close parentheses and H subscript 2 open parentheses italic g close parentheses plus begin inline style 7 over 2 end style O subscript 2 open parentheses italic g close parentheses yields C subscript 2 H subscript 2 O open parentheses italic g close parentheses and O subscript 2 open parentheses italic g close parentheses space increment H subscript 1 equals space minus sign 138 space kJ C subscript 2 H subscript 2 O open parentheses italic g close parentheses and O subscript 2 open parentheses italic g close parentheses yields 2 C O subscript 2 open parentheses italic g close parentheses and 3 H subscript 2 O open parentheses italic g close parentheses space increment H subscript 4 equals space minus sign 1.548 space kJ 2 C O subscript 2 open parentheses italic g close parentheses and 3 H subscript 2 O open parentheses italic g close parentheses yields 2 C O subscript 2 open parentheses italic g close parentheses and 2 H subscript 2 O open parentheses italic g close parentheses space increment H subscript 3 equals space plus 286 space kJ end style 


Maka nilai begin mathsize 14px style increment H subscript 2 end style adalah


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell increment H subscript 2 end cell equals cell increment H subscript 1 plus increment H subscript 4 plus increment H subscript 3 end cell row blank equals cell left parenthesis minus sign 138 minus sign 1.548 plus 286 right parenthesis space kJ end cell row blank equals cell negative sign 1.400 space kJ end cell end table end style 


Jadi, nilai dari begin mathsize 14px style increment H subscript 2 end style adalah begin mathsize 14px style negative sign 1.400 space kJ end style 

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