Page 8 - UKBM TAMBAH COVER

KIM – 3.1/4.1/5/1.1

3. Sebanyak 7 g zat X dilarutkan dalam 200 g benzena (Kb benzena = 3,7 oC/m). Jika titik
didih benzena murni adalah 35 oC dan larutan mendidih pada 36,85 oC, tentukan massa
molekul relatif zat tersebut.

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4. Sebanyak 30 gram glukosa (Mr=180) dilarutkan dalam 250 gram air. Apabila diketahui
tetapan kenaikan titik didih molal air adalah 0,52 0C. Tentukan titik didih larutan

tersebut !
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5. Agar air sebanyak 1 liter (ρ=1 g/mL) dapat mendidih pada suhu 100,26 0C, tentukan
massa Sukrosa (Mr=342) yang harus dilarutkan kedalamnya jika kenaikan titk didih

molal air=0,52 0C
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6. Massa air yang harus disediakan untuk melarutkan 45 gram urea (Mr=60) agar
larutannya mendidih pada suhu 101,95 C adalah … (Kb air=0,52 C)

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Kegiatan Belajar 3

1. Bacalah teks tentang “ Sifat koligatif larutan” dalam buku teks pelajaran (BTP) Kimia Kelas XII
halaman 12 s.d. 14

2. Kemudian, jawablah pertanyaan – pertanyaan berikut !
No. Pertanyaan Jawaban

1. Berdasarkan pengertian sifat koligatif
larutan, kaitkan hubungan jumlah zat terlarut

dengan penurunan titik beku larutan dengan
benar!

2. Gambarkan bagaimana hubungan antara