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