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Fugasitas

Fugasitas adalah besaran dari suatu tekanan ekuivalen yang dinyatakan dalam dimensi tekanan sebagai pengganti tekanan p menurut hukum gas ideal.[1] Pada gas tidak ideal perhitungan dipermudah dengan mengganti tekanan dari besaran tersebut.[1] Fugasitas di fasa uap dinyatakan dalam bentuk koefisien fugasitas yang didefinisikan sebagai perbandingan antara fugasitas di fasa uap dan tekanan parsial komponen.[2] Sedangkan, fugasitas di fasa cair umumnya dinyatakan dalam bentuk koefisien aktivitas yangdidefinisikan sebagai perbandingan antara fugasitas di fasa cair dan hasil kali antarafraksi mol komponen di fasa cair dan fugasitas komponen pada keadaan standar dalam perhitungan-perhitungan koefisien aktivitas adalah kondisi cairan murni.[2]

Fugasitas ditentukan secara eksperimen atau diestimasi melalui berbagai model seperti gas Van der Waals yang mendekati gas nyata. Tekanan gas ideal dan fugasitas berhubungan melalui koefisien tak berdimensi yang disebut koefisien fugasitas .[3]

Sebagai contoh, gas nitrogen pada 100 atm, koefisien fugasitasnya 0.9703. Untuk gas ideal, fugasitas sama dengan tekanan sehingga bernilai 1.

Fugasitas liquid murni

Fugasitas vs. tekanan untuk etana pada −60 °F (−51 °C).

Untuk liquid murni pada kesetimbangan uap-cair, fugasitas fasa uap sama dengan fugasitas fasa liquid. Pada tekanan diatas tekanan uap, fugasitas fasa liquid adalah:[4]

dengan adalah volume molar liquid.

Faktor koreksi fugasitas, , dihitung pada tekanan uap. Bagian eksponensial dari persamaan adalah faktor koreksi Poynting dan nilainya mendekati 1.0 kecuali tekanannya sangat besar.

Referensi

  1. ^ a b (Indonesia)Shaadily, Hasan. Ensiklopedia Indonesia Jilid 3. Jakarta: Ikhtiar Baru dan Van Hoeve.
  2. ^ a b "Fugasitas". Diarsipkan dari versi asli tanggal 2016-03-10. Diakses tanggal 2014-06-26. 
  3. ^ Atkins, Peter; John W. Locke (January 2002). Atkins' Physical Chemistry (edisi ke-7th). Oxford University Press. ISBN 0-19-879285-9. 
  4. ^ Prausnitz et al. Molecular Thermodynamics of Fluid Phase Equilibria 3ed. Prentice-Hall: 1999, pp.40-43.

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