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Jawabannya:Pelajaran. : Kimia
Materi. : Termokimia
Kelas. : XI IPA
Pembahasan:
Dik:
V. HCl= 50 gr → 0,05 L
M.magnesium = 5 gr
∆t= 27°C → 27°K
M. HCl= 150 j/g
V. Magnesium= 50 gr → 0,05 L
c = 3 j/g
Dit :
∆H. Reaksinya?
Jwb:
∆H reaksi
V.air=V HCL + V mag
mL= 50 + 150
m. air= p. v= 50. 150
m. air= 7500 j/g
Q= mc∆t
Q= 7500 j/g . 3j/g. K. 27°C
Q=607500 J
Q=607,5 KJ
Q reaksi = Q larutan
= 607,5 KJ
n. magnesium = v. m
mol/L = 0,05 L. 5 gr
mol/L = 0,25 gr/L
n. HCl = v. m
n. HCl = 0,05 L. 150 j/g
n. HCl = 7,5 j/gr/L
maka:
∆H reaksinya
= 1/mol . (-607,5 KJ)
= 1/0,25 mol. (-607,5 KJ)
mol= -607,5 KJ/0.25 mol
mol= -2430 KJ/mol
Jadi ∆H reaksinya = -2430 KJ/mol
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