Mapel : Kimia
Kelas : 11
Materi : Termokimia
Kata Kunci : Entalpi penguraian
Penyelesaian
H2 + Cl2 → 2HCl , ∆H= -183kJ
pembentukan HCl standar 1 mol 25°C
1/2H2 + 1/2Cl2 → HCl ∆H = -91,5kJ
Penguraian HCl standar
HCl → 1/2H2 + 1/2Cl2 →∆H = +91,5kJ
penguraian 14,6g HCl
Mr HCl = 35,5 + 1 = 36,5
mol HCl = gr/Mr
mol HCl = 14,6/36,5 = 0,4
q = ∆H × n
q = 91,5×0,4 = 36,6kJ
karena ∆H positif maka terjadi menyerapan kalor
HCl → H2 + Cl2 , ∆H = +36,6kJ
Kunci → [B]
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Mapel : Kimia
Kelas : 11
Materi : Termokimia
Kata Kunci : Entalpi penguraian
Penyelesaian
H2 + Cl2 → 2HCl , ∆H= -183kJ
pembentukan HCl standar 1 mol 25°C
1/2H2 + 1/2Cl2 → HCl ∆H = -91,5kJ
Penguraian HCl standar
HCl → 1/2H2 + 1/2Cl2 →∆H = +91,5kJ
penguraian 14,6g HCl
Mr HCl = 35,5 + 1 = 36,5
mol HCl = gr/Mr
mol HCl = 14,6/36,5 = 0,4
q = ∆H × n
q = 91,5×0,4 = 36,6kJ
karena ∆H positif maka terjadi menyerapan kalor
HCl → H2 + Cl2 , ∆H = +36,6kJ
Kunci → [B]