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soal kimia jawabkan bah?
1. urea (CO(NH2)2) yang massanya 15 gram dilarutkan dalam 250 gram air (Ar H=1 , C=12, O=16, dan N = 14 ). bilatetapan penurunan titik beku molar air (Kb) =1,86 C/m , tentukan titik beku larutan tersebut
2. Hitunglah penurunan uap yang dibuat dari pelarutan 9,5 g tiourea (Mr=76) ke dalam 90 g air ( tekanan uap air pada 25 C adalah 23,76 mmHg)
1 Answer
- Anonymous8 years agoFavorite Answer
(1).
To - T = (w/Mr)(1000/P) Kf
0 - T = (15/(12 + 16 + 2(14 + 2)))(1000/250) 1.86
T = -1.86 °C
(2).
ΔP = (w/Mr)/(w/Mr + w'/Mr') Po
ΔP = (9.5/76)/(9.5/76 + 90/18) 23.76
ΔP = 0.5795 mmHg