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Ke dalam 1 liter air, dilarutkan 12 gram urea. Jik...

Ke dalam 1 liter air, dilarutkan 12 gram urea. Jika diketahui massa malekul relative urea = 60, serta nilai begin mathsize 14px style K subscript f end style dan begin mathsize 14px style K subscript b end style air adalah begin mathsize 14px style 1 comma 86 degree C space m to the power of negative sign 1 end exponent end style dan begin mathsize 14px style 0 comma 52 degree C space m to the power of negative sign 1 end exponent end style, tentukan titik beku dan titik didih larutan tersebut.

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Jawaban:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell italic m subscript air end cell equals cell italic rho cross times V end cell row blank equals cell 1 space g space mL to the power of negative sign 1 end exponent cross times 1.000 space mL end cell row blank equals cell 1.000 space g end cell end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row italic m equals cell italic m subscript urea over italic M subscript r cross times fraction numerator 1.000 over denominator italic m subscript air end fraction end cell row blank equals cell 12 over 60 cross times fraction numerator 1.000 over denominator 1.000 end fraction end cell row blank equals cell 0 comma 2 space m end cell end table end style 


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell increment italic T subscript f end cell equals cell K subscript f cross times italic m end cell row blank equals cell 1 comma 86 degree C space m to the power of negative sign 1 end exponent cross times 0 comma 2 space m end cell row blank equals cell 0 comma 372 space m end cell end table end style  

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell italic T subscript f end cell equals cell italic T subscript f degree minus sign increment italic T subscript f end cell row blank equals cell 0 degree C minus sign 0 comma 372 degree C end cell row blank equals cell negative sign 0 comma 372 degree C end cell end table end style 

Titik beku larutan sebesar begin mathsize 14px style negative sign 0 comma 372 degree C end style.begin mathsize 14px style space end style 


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell increment italic T subscript b end cell equals cell K subscript b cross times italic m end cell row blank equals cell 0 comma 52 degree C space m to the power of negative sign 1 end exponent cross times 0 comma 2 space m end cell row blank equals cell 0 comma 104 degree C end cell end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell italic T subscript b end cell equals cell italic T subscript b degree plus increment italic T subscript b end cell row blank equals cell 100 degree C plus 0 comma 104 degree C end cell row blank equals cell 100 comma 104 degree C end cell end table end style 

Titik didih larutan sebesar begin mathsize 14px style 100 comma 104 degree C end style.undefined 

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