
Kuis Mol dan Ar
Authored by Ana Pertiwi
Chemistry
10th Grade

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10 questions
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1.
MULTIPLE CHOICE QUESTION
45 sec • 10 pts
"1 mol gas oksigen (O2) mengandung 6,02 x 1023 atom oksigen".
Pernyataan tersebut salah karena ......
1 mol O2 seharusnya mengandung 12,04 x 1023 atom oksigen
Bilangan Avogadro hanya berlaku untuk unsur logam
Oksigen adalah monoatomik (O), bukan diatomik (O2)
Nilai mol O2 tidak mempengaruhi jumlah partikel
Jumlah partikel harus dinyatakan dalam gram
2.
MULTIPLE CHOICE QUESTION
45 sec • 10 pts
Perhatikan data berikut.
- 0,1 mol gas helium (He)
- 0,05 mol gas nitrogen (N2)
- 2 mol air (H2O)
Pernyataan yang tepat terkait jumlah partikel ketiga zat di atas adalah ......
He < N2 <H2O
N2 < He < H2O
H2O < N2 < He
N2 = He = H2O
He = N2 < H2O
3.
MULTIPLE CHOICE QUESTION
45 sec • 10 pts
Jika 0,25 mol senyawa Ca3(PO4)2 dilarutkan, maka total ion yang dihasilkan adalah ……
1,505 x 1023 ion
3,01 x 1023 ion
7,525 x 1023 ion
15,05 x 1023 ion
30,1 x 1023 ion
4.
MULTIPLE CHOICE QUESTION
45 sec • 10 pts
Dua sampel gas, yaitu 0,5 mol gas oksigen (O2) dan 1 mol gas hidrogen (H2) diberikan kepada dua siswa. Siswa A mengatakan jumlah molekul hidrogen lebih banyak daripada oksigen, sementara siswa B mengatakan jumlah atom dalam oksigen lebih banyak.
Siapakah yang benar?
hanya siswa A
hanya siswa B
keduanya benar
keduanya salah
tidak dapat ditentukan
5.
MULTIPLE CHOICE QUESTION
45 sec • 10 pts
Dalam 1,204 x 1024 molekul H2SO4, jumlah atom hidrogen yang terkandung adalah ……
1 mol
2 mol
4 mol
6 mol
8 mol
6.
MULTIPLE CHOICE QUESTION
45 sec • 10 pts
Suatu unsur hipotetis Z memiliki 3 isotop, yakni Z-50 (20%), Z-51 (50%) dan Z-52 (30%). Jika ditemukan isotop keempat, yakni Z-53 dengan kelimpahan 10%, maka …….
nilai Ar Z tetap
nilai Ar Z meningkat 0,1
nilai Ar Z meningkat 0,3
nilai Ar Z menurun 0,5
nilai Ar Z meningkat 5,3
7.
MULTIPLE CHOICE QUESTION
45 sec • 10 pts
Dalam tabel periodik, Ar klorin adalah 35,45; lebih mendekati 35 daripada 37 meskipun terdapat isotop Cl-37. Simpulan yang logis adalah …….
Kesalahan pengukuran karena seharusnya Ar = 37
Massa Cl-35 diabaikan dalam perhitungan
Kelimpahan Cl-35 jauh lebih dominan
Nilai Ar selalu lebih kecil dari massa isotop terberat
Cl-35 dan Cl-37 memiliki kelimpahan sama
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