
Soal Esay Termokimia
Authored by Indah Purwanti
Chemistry
11th Grade

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5 questions
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1.
OPEN ENDED QUESTION
3 mins • 1 pt
Suatu pabrik kimia menghasilkan asam sulfat (H₂SO₄) melalui proses kontak. Salah satu tahapannya adalah reaksi oksidasi belerang dioksida (SO₂) menjadi belerang trioksida (SO₃): 2SO₂(g) + O₂(g) → 2SO₃(g) ΔH = -198 kJ Jika pabrik tersebut menghasilkan 1 ton SO₃, hitunglah kalor yang dibebaskan!
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2.
OPEN ENDED QUESTION
3 mins • 1 pt
Seorang peneliti ingin mengetahui kalor pembakaran suatu bahan bakar. Ia menggunakan kalorimeter bom dan membakar 1 gram bahan bakar tersebut. Hasilnya, suhu kalorimeter naik sebesar 10°C. Jika kapasitas kalor kalorimeter adalah 2 kJ/°C dan kalor jenis air 4,18 J/g°C, tentukan kalor pembakaran bahan bakar tersebut!
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3.
OPEN ENDED QUESTION
3 mins • 1 pt
Diketahui reaksi:
N₂(g) + 3H₂(g) → 2NH₃(g) ΔH = -92 kJ
a. Apakah reaksi tersebut eksoterm atau endoterm? Jelaskan!
b. Hitunglah kalor yang dibebaskan jika 1 mol gas nitrogen bereaksi dengan gas hidrogen berlebih!
c. Gambarkan diagram tingkat energi untuk reaksi tersebut!
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4.
OPEN ENDED QUESTION
3 mins • 1 pt
Di kota X, terjadi peningkatan kadar gas SO₂ di udara akibat pembakaran bahan bakar fosil pada industri dan kendaraan. Reaksi pembakaran SO₂ menjadi SO₃ merupakan reaksi eksoterm:
2SO₂(g) + O₂(g) → 2SO₃(g) ΔH = -198 kJ
Jelaskan bagaimana reaksi ini berkontribusi terhadap pembentukan hujan asam. Jika pemerintah kota X berupaya mengurangi emisi SO₂, teknologi apa yang dapat diterapkan untuk meminimalisir dampak termokimia dari reaksi tersebut?
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5.
OPEN ENDED QUESTION
3 mins • 1 pt
Diberikan dua persamaan termokimia berikut:
2H₂(g) + O₂(g) → 2H₂O(l) ΔH = -571 kJ 2H₂O(l) → 2H₂(g) + O₂(g) ΔH = +571 kJ
a. Apa perbedaan mendasar antara kedua reaksi tersebut?
b. Jelaskan bagaimana perubahan entalpi (ΔH) berkaitan dengan arah reaksi!
c. Jika reaksi pertama dibalik dan koefisien reaksinya dibagi dua, berapakah nilai ΔH yang baru?
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