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MOLALITAS

MATERI KIMIA KLS XI

florestau
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MOLALITAS

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  1. MOLALITAS (m) Molalitasadalahsatuan yang menyatakanbanyaknya mol zatterlarutdalamsetiap 1000 grpelarut Secaramatematispernyataantersebutdapatdinyatakandenganrumus: . m = n x 1000 . P Atau m = gr x 1000 . MrP . Ket. n = Jumlah mol zatterlarut . P = Massa Pelarut . ContohSoal 1 . Hitunglahmolalitslarutan yang terjadibila 24 grkristal MgSO4 dilarutkandalam 400 gr air (Mr MgSO4 = 120 ) 2. 18 grglukosa ( Mr = 180) dilarutkankedalam 100 gr air. Tentukanmolalitaslarutanglukosa ?

  2. Penyelesaian Soal 1 • Hitunglah molalits larutan yang terjadi bila 24 gr kristal MgSO4 dilarutkan dalam 400 gr air (Mr MgSO4 = 120 ) • Penyelesaian • . Dik MgSO4 = 24 gr • . P = 400 gr • . Dit m………….? • . Jawab • . M = gr x 1000 Mr P • . = 24 gr x 1000 120 400 • . = 0.5 m

  3. Penyelesaian Soal 2 • 2. 18 gr glukosa ( Mr = 180) dilarutkan kedalam 100 gr air. Tentukan molalitas larutan glukosa ? • Penyelesaian • . Dik. Glukosa = 18 gr • . Mr = 180 • . P = 100 gr • . Dit m……………..? • . M = gr x 1000 Mr P • . = 18 gr x 1000 180 100 = 1 m

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