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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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FindingNVRLAND FindingNVRLAND
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8 years ago
If I have the boiling point of 2 different substances, is there a way for me to be able to determine the boiling point of the mixture of the substances?  Face with Cold Sweat
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#1
Educator
8 years ago
I believe *it is* possible.

Here's an example:

Similar Question
If I add 85.5g of CaCl2 to 750.0g of water, what will be the freezing point and boiling point of the resulting solution? The kf of water is 1.86 degrees C and the kb of water is 0.515 degrees C/m.

Answer
Boiling point
1) covert grams to moles of Cacl2
85.5g cacl2 x( 1 mole CaCl2/ 110.9g CaCl2) =0.771 moles
2) covert grams to kilograms of H2O
750g x ( 1kg / 10^3 g) =0.750 kg
3) find molality
molality = moles of solute/ kg of solvent
= 0.771/0.750
=1.023 mol/kg
4) dela T = i(Kb)(m)
= 3(0.515 C/m)(1.028m)
= 1.59 C +100.0C = 101.59C Rightwards Arrow boiling point of water is 100C that why I add
Freezing point
dela T = i(Kf)(m)
= 3(1.86C/m)(1.028m)
= 5.74C
0C -5.74C = -5.74C (freezing point of water is 0C that why I subtract)
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