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Jawaban A.Pembahasan di gambar
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Diket :Volume gas, V = 3000 cm³ = 3.10¯³ m³
Suhu gas, T = 20°C = 293 K
Tekanan alat, P = 25 atm
Tekanan udara luar, Po = 1 atm
Tekanan total, Ptot = 26 atm = 26.10^5 Pa
Massa molar gas oksigen, Mr = 32 kg/kmol = 32 gram/mol
Konstanta gas, R = 8,314 J/mol.K
Tanya :
Massa gas oksigen, m = __?
Jawab :
Step 1
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Cari dulu mol nya yak, n = __?
P.V = n.R.T
n = P.V / R.T
n = 26.10^5•3.10¯³ / 8,314•293
n = 7800 / 2436,002
n = 3,2 mol
Step 2
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Massa gas oksigen, m = __?
n = m/Mr
m = n.Mr
m = [3,2 mol]•[32 gram/mol]
m = 102,5 gram
m = 0,1025 kg
Atau
m = 0,1 kg
Jawaban : A
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