STOIKIOMETRI (Persentase Komposisi)
Quiz
•
Chemistry
•
1st Grade
•
Practice Problem
•
Hard
Shoyang Gadis Supratania
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5 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Berapa persen (%) C dalam urea CO(NH2)2, jika diketahui Ar.C = 12, Ar.O = 16, Ar.N = 28 dan Ar.H =1?
26,67%
46,67%
6,67%
20%
22%
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Tentukan persentase massa pada unsur Pb dalam tetraetil timbal (Pb(C2H5)4 ; suatu zat aditif untuk menaikkan angka oktana bensin! (Ar : Pb=207; C=12;H=1)
63%
64%
61%
65%
62%
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Suatu sampel dianalisis mengandung 12,78%karbon,2,13%hidrogen,dan85,09%bromin.jika massa sampel yang di analisis 1,88g,berapa massa Hidrogen ?
0,03gram
0,2403gram
0,04gram
1,6gram
0,036gram
4.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Semua senyawa berikut adalah pupuk yg menambah kandungan nitrogen dlm tanah.manakah dari senyawa berikut yang merupakan sumber nitrogen terbanyak berdasarkan persen massanya?(Ar: N=14; H=1; C=12; O=16)
urea,CO(NH2)2
Amonium nitrat,NH4NO3
Guanidin,HNC(NH2)2
Amonia,NH3
Amonium NH4OH
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Berapa persentase masa dari unsur Fe dalam prussian blue ( Fe4 [ Fe (CN)6 ] 3 suatu zat warna yang digunakan dalam cat dan tinta cetak? (Ar: Fe=56; C=12; N=14)
400,,3%
450,2%
415,6%
410,5%
413,7%
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