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Sebanyak 6,4 g garam ionik MX dilarutkan dalam 1 L air. Jika tekanan osmosis larutan ini 3,28 atm pada , Mr MX adalah .......

Sebanyak 6,4 g garam ionik MX dilarutkan dalam 1 L air. Jika tekanan osmosis larutan ini 3,28 atm pada 27 space to the power of o C space left parenthesis R equals 0 comma 082 space L. a t m. m o l to the power of negative 1 end exponent. K to the power of negative 1 end exponent right parenthesis, Mr MX adalah .......

  1. 27

  2. 64

  3. 84

  4. 96

  5. 112

Jawaban:

MX adalah senyawa ionic sehingga :

M X space left parenthesis a q right parenthesis rightwards arrow M to the power of plus plus X to the power of minus space space space space space space space space space n equals 2    

i = 1 + (n-1) α ,     α = 1

i = 1 + (2-1) 1 = 2

Kemudian tekanan osmotiknya :

pi equals M cross times R cross times T cross times i  3 comma 28 space a t m equals M cross times 0 comma 082 cross times 300 space K cross times 2  M equals fraction numerator 3 comma 28 over denominator 0 comma 082 cross times 300 cross times 2 end fraction  space space space equals fraction numerator 3 comma 28 over denominator 49 comma 2 end fraction  space space space equals 2 over 30  space space space equals 0 comma 067 space M  fraction numerator m o l space M X over denominator V space l a r u tan end fraction equals 2 over 30  fraction numerator m o l space M X over denominator 1 space L i t e r end fraction equals 2 over 30  M o l space M X equals 2 over 30 m o l  M r space M X equals fraction numerator m a s s a over denominator m o l end fraction  space space space space space space space space space space space space equals fraction numerator 6 comma 4 space g r a m over denominator begin display style 2 over 30 end style m o l end fraction  space space space space space space space space space space space space equals 96 space g divided by m o l

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