
STOIKIOMETRI
Authored by Yufitri N
Chemistry
10th Grade
Used 1+ times

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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Perhatikan persamaan reaksi berikut
Fe2O3 + 3CO → 2Fe + 3CO2
Dari reaksi tersebut, ternyata dihasilkan 224 gr besi. Massa besi (III) oksida yang bereaksi adalah …. (Ar Fe = 56, C = 12, dan O = 16)
320 gr
300 gr
240 gr
450 g
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Seorang peneliti mereaksikan 8,1 gr aluminium dengan asam klorida. Reaksi tersebut menghasilkan aluminium klorida dan gas hidrogen. Pada suhu dan tekanan tertentu, 1 mol gas hidrogen memiliki volume 6 liter. Adapun persamaan reaksinya adalah sebagai berikut.
2Al + 6HCl → 2AlCl3 + 3H2
Volume gas hidrogen yang dihasilkan pada reaksi tersebut adalah …. (Ar Al = 27)
1,8 liter
4,8 liter
4,5 liter
2,7 liter
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Reaksi pembakaran 32 gram gas metana berlangsung seperti reaksi berikut
CH4 + 2O2 → CO2 + 2H2O
Jika massa oksigen yang digunakan pada pembakaran tersebut 160 gr, banyaknya mol H2O yang terbentuk adalah …. (Ar C = 12, O = 16)
4 mol
3 mol
l2 mol
2,5 mol
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Kristal CuSO4 (Mr = 159,5)sebanyak 478,5 gr mampu menyerap 270 gram air. Akibatnya, terbentuk senyawa hidrat CuSO4.xH2O. Banyaknya molekul air yang terserap di dalam senyawa hidrat tersebut adalah
6
4
5
3
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Unsur Z mampu membentuk senyawa dengan unsur O membentuk Z2O3. Jika massa unsur Z = 3,2 gr dan massa unsur O = 9,6 gr, berapakah massa atom relatif Z? (Ar O = 16)
6
7
8
9
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