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19.)
2KMnO₄ + 16HCl → 2MnCl₂ + 8H₂O + 5Cl₂ + 2KCl
massa Cl₂ = 3,55 gram
mol Cl₂ = massa/Mr
= 3,55/71
= 0,05 mol
mol HCl = 16/5 x 0,05
= 0,16 mol
massa HCl = mol x Mr
= 0,16 x 36,5
= 5,84 gram (Jawaban A)
23.)
Larutan asam klorida = HCl
logam kalsium = Ca
Persamaan reaksi yang terjadi adalah :
Ca + 2HCl → CaCl₂ + H2 (Jawaban D)
27.)
Persamaan reaksi :
2AgNO₃ + K₂CrO₄ → Ag₂CrO₄ + 2KNO₃
mol K₂CrO₄ = M x V
= 0,1 x 10
= 1 mmol
mol AgNO₃ = 2/1 x 1 = 2 mmol
V AgNO₃ = mol/M
= 2/0,1
= 20 mL (Jawaban B)
Nomor 42
Nomor 43
Nomor 48
Nomor 49 (Soal gak bisa dibaca)