Ulangan Harian 1: Stoikiometri
Quiz
•
Chemistry
•
11th Grade
•
Medium
Fadhillah Arifin
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10 questions
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1.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Jika diketahui Ar Ca = 40, C = 12, O = 16 dan bilangan Avogadro = 6,02×1023, maka 50 gram CaCO3 mempunyai jumlah molekul …
3,01 x 1021
3,01 x 1023
6,02 x 1022
3,10 x 1023
1,204 x 1023
2.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Massa glukosa (C6H12O6) yang harus dilarutkan dalam 500 mL air untuk membuat larutan glukosa (C6H12O6) 0,2 M (Ar C = 12, H = 1, dan O = 16) adalah ...
9 gram
18 gram
36 gram
54 gram
90 gram
3.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Dalam 100 gram senyawa terdapat 40% kalsium, 12% karbon, dan 48% oksigen. Jika Ar Ca = 40, C = 12, dan O = 16, maka rumus empiris senyawa tersebut adalah ...
CaCO
CaCO2
CaCO3
Ca2CO3
CaCO2
4.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Pada senyawa K2Cr2O7 (Ar K = 39, Cr = 52, O = 16), kadar oksigen adalah …
12%
28%
38%
42%
62%
5.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Dalam 100 gram pupuk urea CO(NH2)2 terdapat 22,4 gram nitrogen (Ar C = 12, O = 16, N = 14, H = 1). Kadar nitrogen dalam pupuk urea tersebut adalah …
96%
48%
44,8%
23,3%
22,4%
6.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Suatu senyawa hidrokarbon mempunyai rumus empiris CH2 (Ar C = 12 dan H = 1). Jika 5,6 liter (STP) gas tersebut mempunyai massa 14 gram, maka rumus molekul gas tersebut adalah …
C2H4
C2H6
C3H8
C4H8
C5H10
7.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Penguraian 24,5 gram KClO3 (Ar K = 39, Cl = 35,5, dan O = 16) menurut reaksi:
2 KClO3 ⎯⎯→ 2 KCl + 3 O2
Pada keadaan standar dihasilkan gas oksigen sebanyak …
2,24 L
4,48 L
6,72 L
8,96 L
11,2 L
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