Sebanyak 100 mL NaOH 0,20 M dicampur dengan 50 mL HCl 0,35 mL. Temperatur awal kedua larutan adalah 25 oC dan naik menjadi 26,5 oC setelah pencampuran. Entalpi reaksi netralisasi per mol H2O yang terbentuk adalah .... (kalor jenis larutan = 4,2 J g–1 oC–1, massa jenis larutan = 1 g/mL)
Tryout Bimbel Kimia OSN-K 2025

Quiz
•
Chemistry
•
11th Grade
•
Hard
Daji Rohman
Used 5+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
–47,3 kJ
–31,5 kJ
–25,2 kJ
–54,0 kJ
–18,0 kJ
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Diketahui energi ikat O−O dan O=O berturut-turut 146 dan 498 kJ/mol. Jumlah energi yang dilepaskan/diserap pada disosiasi 1 mol gas hidrogen peroksida menjadi uap air dan molekul oksigen adalah ....
diserap 103 kJ energi
dilepaskan 103 kJ energi
dilepaskan 206 kJ energi
diserap 203 kJ energi
dilepaskan 352 kJ energi
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Berdasarkan data entalpi reaksi berikut: 2B(s) + 3H2(g) → B2H6(g) ∆H° = 45 kJ 2H2(g) + O2(g) → 2H2O(l) ∆H° = –570 kJ B2H6(g) + 3O2(g) → B2O3(s) + 3H2O(l) ∆H° = –2150 kJ Entalpi reaksi pembentukan B2O3(s) adalah ....
–1250 kJ/mol
–2960 kJ/mol
–2500 kJ/mol
–2150 kJ/mol
–1535 kJ/mol
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Reaksi eksotermis berikut yang berlangsung spontan pada temperatur berapa pun adalah .... i. H2(g) + Br2(l) → 2HBr(g) ii. NH3(g) + HCl (g) → NH4Cl(s) iii. 2H2S(g) + SO2(g) → 3S(s) + 2H2O(l)
hanya i
i dan ii
i dan iii
ii dan iii
i, ii, dan iii
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Konfigurasi elektronik ion G2+ adalah 1s22s22p6 dan unsur L adalah 1s22s22p63s23p5. Formula senyawa yang paling mungkin terbentuk antara unsur G dan L adalah...
GL
GL2
G2L
G2L3
G2L5
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Rumus molekul suatu garam adalah XCl2. Ion X dalam garam ini mempunyai 27 elektron, maka logam X adalah...
Ni
Co
Fe
Cu
Zn
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Analisis unsur suatu asam menunjukkan bahwa persen massa unsur penyusun molekul asam adalah 5,89% H, 70,6% C, dan 23,5% O. Bila berat molekul asam tersebut adalah 136 g/mol, bagamimana formula molekulnya?
C6H16O3
C7H4O3
C8H8O2
C9H12O
C9H16O
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