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Penyelesaian :
Mol Urea = Massa Urea / Mr Urea = 30 / 60 = 0,5 Mol
Mol H2O = Massa H2O / Mr H2O = 500 / 18 = 27,7 Mol
Fraksi Mol Urea = 0,5 / 0,5 + 27,7
= 0,5 / 28,2
= 0,017
Kurang Lebih begitulah penyelesaiannya .,
Silahkan di periksa kembali .,
Jika ada kesalahan saya mohon maaf .,
Semoga Membantu !!! ^_^