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Jika diketahui ΔH°c C 3 H 6 = –a kJ mol –1 ; ΔH°fCO 2 (g) = –b kJ mol –1 ; ΔH°fH 2 O(l) = –c kJ mol –1 . Berapakah harga ΔH°f C 3 H 6 (dalam kJ mol –1 ) adalah ....

Jika diketahui ΔH°c C3H6= –a kJ mol–1 ; ΔH°fCO2 (g) = –b kJ mol–1; ΔH°fH2O(l) = –c kJ mol–1. Berapakah harga ΔH°f C3H6 (dalam kJ mol–1) adalah ....

  1. a – 3b – 3c    

  2. a + 3b +3c

  3. a –3b + 3c        

  4. –a + 3b + 3c

  5. a + 3b + 3c

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S. Utari

Master Teacher

Mahasiswa/Alumni Universitas Negeri Medan

Jawaban terverifikasi

Pembahasan

Reaksi pembakaran propana: C 3 H 6 + 9 / 2 O 2 3CO 2 + 3H 2 O H = -a kJ/mol Jika diketahui harga entalpi pembentukan standard;

Reaksi pembakaran propana:

C3H6 + 9/2 O2 rightwards arrow 3CO2 + 3H2H = -a kJ/mol

Jika diketahui harga entalpi pembentukan standard;

increment straight H to the power of straight o straight c space straight C subscript 3 straight H subscript 6 space equals space straight capital sigma space increment straight H to the power of straight o straight f space produk space minus space straight capital sigma increment straight H to the power of straight o straight f space reaktan space space minus space straight a space equals space left parenthesis increment straight H to the power of straight o straight f space CO subscript 2 space plus space increment straight H to the power of straight o straight f space straight H subscript 2 straight O right parenthesis minus space left parenthesis increment straight H to the power of straight o straight f space straight C subscript 3 straight H subscript 6 right parenthesis space space minus space straight a space equals space left parenthesis negative 3 straight b space plus space left parenthesis 3 minus straight c right parenthesis right parenthesis space minus space left parenthesis increment straight H to the power of straight o straight f space straight C subscript 3 straight H subscript 6 right parenthesis space increment straight H to the power of straight o straight f space straight C subscript 3 straight H subscript 6 space equals space straight a space – space 3 straight b space – space 3 straight c space

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Jika data entalpi pembentukan standar: C 3 H 8 (g) = –104 kJ mol –1 ; CO 2 (g) = –394 kJ mol –1 ;H 2 O(l) = –286 kJ mol –1 Harga ΔH untuk reaksi pembakaran propana: C 3 H 8 (g) + 5O 2 (g) →3C...

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