Fisika

Pertanyaan

KUIS FISIKA
Kode: 05-1-2
KUIS FISIKA Kode: 05-1-2

2 Jawaban

  • Jawaban A.
    Pembahasan di gambar
    Gambar lampiran jawaban ShanedizzySukardi
  • 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
    ---------
    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
    ----------
    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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    FZA