a. a Al 2 S 3 + b H 2 O ⎯⎯→ c Al(OH) 3 + d S
b. a Cu + b HNO 3 ⎯⎯→ c Cu(NO 3 ) 2 + d H 2 O
c. a Zn + b HNO 3 ⎯⎯→ c Zn(NO 3 ) 2 + NH 4 NO 3 + 3 H 2 O
d. p C 3 H 8 + q O 2 ⎯⎯→ r CO 2 + s H 2 O
e. a C 4 H 10 + b O 2 ⎯⎯→ c CO 2 + d H 2 O
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Setarakan reaksi di bawah :
A.
aAl2S3 + bH2O -> cAl(OH)3 + dH2S
koefisien :
Al : 2a = c
S : 3a = d
H : 2b = 3c + 2d
O : b = 3c
misalkan a = 1,
maka b = 6, c = 2, d = 3
jadi, Al2S3 + 6H2O -> 2Al(OH)3 + 3H2S
2.
aCuO + bHNO3 -> cCu(NO3)2 + dH2O
koefisien :
Cu : a = c
H : b = 2d
N : b = 2c
O : a + 3b = 6c + d
misal a = 1,
maka b = 2, c = 1, d = 1
c.
aZn + bHNO3 -> cZn(NO3)2 + dNH4NO3 + eH2O
koefisien :
Zn : a = c
H : b = 4d + 2e
N : b = 2c + 2d
O : 3b = 6c + 3d + e
misal a = 4,
maka b = 10, c = 4, d = 1, e = 3
jadi, 4Zn + 10HNO3 -> 4Zn(NO3)2 + NH4NO3 + 3H2O
d.
pC3H8 + qO2 -> rCO2 + sH2O
koefisien :
C : 3p = r
H : 8p = 2s
O : 2q = 2r + s
misal p = 1, q = 5, r = 3, s = 4
jadi, C3H8 + 5O2 -> 3CO2 + 4H2O
e.
aC4H10 + bO2 -> cCO2 + dH2O
koefisien :
C : 4a = c
H : 10a = 2d
O : 2b = 2c + d
misal a = 2, b = 13, c = 8, d = 10
maka 2C4H10 + 13O2 -> 8CO2 + 10H2O
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