MENGHITUNG Ar & Mr
Presentation
•
Chemistry
•
11th Grade
•
Practice Problem
•
Easy
Nendah Nurjanah Nendah
Used 2+ times
FREE Resource
9 Slides • 7 Questions
1
By. Mrs. Nendah
2
Massa Atom Rata-rata
Atom-atom di alam dapat mempunyai massa yang berbeda
Massa atom dihitung berdasarkan massa rata-rata dari seluruh atom yang ada di alam
Massa 1 partikel yang massanya 1,67 X 10-27 kg = 1 sma (satuan massa atom)
3
Contoh
Subject | Subject
4
Massa atom relatif adalah massa rata-rata 1 atom suatu unsur dibandingkan terhadap 1/12 X massa 1 atom C-12
5
Contoh soal
6
Contoh Soal
7
Massa Molekul Relatif (Mr)
8
Massa molekul relatif suatu senyawa molekul merupakan jumlah massa atom relatif dari seluruh atom penyusun senyawa molekul
Massa rumus relatif suatu senyawa ion merupakan jumlah massa atom relatif dari seluruh atom penyusun satu satuan rumus kimia tersebut
9
Multiple Choice
Massa atom relatif suatu unsur adalah ....
massa rata - rata 1 atom unsur tersebut dibandingkan dengan massa rata - rata 1 atom karbon - 12
massa rata - rata 1 atom karbon - 12 dibandingkan dengan massa rata - rata 1 atom unsur tersebut
massa rata - rata 1 atom unsur tersebut dibandingkan dengan 1/12 massa rata - rata 1 atom karbon - 12
massa rata - rata 1 atom unsur tersebut dibandingkan dengan 12 kali massa rata - rata 1 atom karbon - 12
1/12 massa rata - rata 1 atom karbon - 12 dibandingkan dengan massa rata - rata 1 atom unsur tersebut
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Multiple Choice
Jika massa 1 atom X = p gram , massa 1 atom C-12 = q gram, maka Ar X adalah ....
q12p
12qp
12pq
pq12
12 pq
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Multiple Choice
Tembaga alam terdiri atas isotop Cu-65 (20%) dan isotop Cu-63 (80%), maka massa atom relatif tembaga adalah…
63,2 sma
63,3 sma
63,4 sma
63,7 sma
63,9 sma
12
Multiple Choice
Bila diketahui Ar H=1, P=31, O=16. Hitunglah Mr senyawa H3PO4
91
81
98
97
100
13
Multiple Choice
Diketahui Ar Ca=40, O=16, H=1. Hitunglah Mr senyawa Ca(OH)2
57
74
73
50
65
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Multiple Choice
Diketahui Ar H=1, O=16, C=12. Hitunglah Mr dari C12H22O11
180
98
150
342
60
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Open Ended
Bila Mr L(OH)2 = 78 dan Ar H = 1, O = 16 tentukanlah Ar L
16
Terima kasih atas perhatian ananda
Selamat belajar
Semoga sukses
By. Mrs. Nendah
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