Massa atom relatif X = 16
Dik V CO₂ = 20 L dan massanya 17,6 gr
X₂ memiliki massa 3,2 gr dan V = 5 L
Mr CO₂ = Ar C + 2 Ar O
= 12 + (2 x 16) = 12 + 32 = 44
n CO₂ = gr/Mr = 17,6/44 = 0,4 mol
Berdasar persamaan gas ideal
P₁V₁/P₂V₂ = n₁R T₁/n₂R T₂
krn R sama maka
P₁V₁/P₂V₂ = n₁T₁/n₂ T₂
Krn P dan T yg sama maka
V₁/V₂ = n₁/n₂
V₁ /n₁ = V₂ /n₂
V CO₂/n CO₂ = V X₂/n X₂
20/0,4 = 5/ n X₂
20 x n X₂ = 0,4 x 5
n X₂ = 2/20 = 0,1 mol
n = gr/Mr
Mr X₂ = gr/n = 3,2/0,1 = 32
2 Ar X = 32
Ar X = 32/2 = 16
Kategorisasi
Kelas : X
Mapel : Kimia
Materi : Stoikiometri
Kode Kategorisasi : 10.7.9.
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Verified answer
Massa atom relatif X = 16
Dik V CO₂ = 20 L dan massanya 17,6 gr
X₂ memiliki massa 3,2 gr dan V = 5 L
Mr CO₂ = Ar C + 2 Ar O
= 12 + (2 x 16) = 12 + 32 = 44
n CO₂ = gr/Mr = 17,6/44 = 0,4 mol
Berdasar persamaan gas ideal
P₁V₁/P₂V₂ = n₁R T₁/n₂R T₂
krn R sama maka
P₁V₁/P₂V₂ = n₁T₁/n₂ T₂
Krn P dan T yg sama maka
V₁/V₂ = n₁/n₂
V₁ /n₁ = V₂ /n₂
V CO₂/n CO₂ = V X₂/n X₂
20/0,4 = 5/ n X₂
20 x n X₂ = 0,4 x 5
n X₂ = 2/20 = 0,1 mol
n = gr/Mr
Mr X₂ = gr/n = 3,2/0,1 = 32
2 Ar X = 32
Ar X = 32/2 = 16
Kategorisasi
Kelas : X
Mapel : Kimia
Materi : Stoikiometri
Kode Kategorisasi : 10.7.9.