Solution of an unknown solute in cyclohexane. Freezing-point, Find molality?

Question

Assume that you have a solution of an unknown solute in cyclohexane. If the solution has a freezing-point depression of 9.50Celcius, what is the molality of this solution? (The molal freezing-point constant of cyclohexane is 20.2 C/m)Freezing Point: 9.50Moles: ? - you need the amt of grams or have the known molar mass>?Molality: ? - you need the amt of solution - moles of solute / kg of solvent>?

Lavinia Carroll · Accepted Answer

The equation for freezing point depression isdelta T = KcmFor your problem delta T = 9.5; K = 20.2 and you need to solve for m, the molality. So, m = deltaT/K = 9.5/20.2 = 0.47 molal.

Lavinia Carroll · Answer

Freezing Point Depression Constant Of Cyclohexane

Lavinia Carroll · Answer

For the best answers, search on this site https://smarturl.im/aDDT6You must you the melting point depression equation: delta T = ikm i = van't off factor (excuse my spelling) assume this is 1 k = freezing point depression constant (for cyclohexane in this case, you should be given this value) m = molality of the solution = moles of unknown solute / kg of solvent (.0502kg) Using that equation, you can determine the molality of the solution. Since, molality of the solution = moles of unknown solute / kg of solvent; molality = (grams solute/molar mass solute) / (kg of solvent) This can be done because molar mass = grams/mole ----> moles = grams/(molar mass) Since all variables are known except molar mass, you can calculate the molar mass of the unknown substance.

Lavinia Carroll · Answer

Overcome your Depression Without Medication

Lavinia Carroll · Answer

Stop Depression - Overcome your Depression Without Medication - http://stopdepresion.info/effective-way-2601.htmlMethod to overcome depression and anxiety without pills and expensive therapies.You will cure your depression just by following him directions. It is a simple, fast and effective method.+) Find food for treating depression.+) Stop taking pills.+) Never relapse again.+) Apply an effective method to discover and eliminate the root problem.Method provide the "key" to your new life, for you will be able to:+) Have more confidence in yourself.+) Sleep better and feel more relaxed, with no stress.+) Be comfortable with yourself and with other people.+) Stop anxiety attacks.Get it Now! - http://stopdepresion.info/effective-way-2601.htmlEnjoy every day as you did before and Start feeling fulfilled and enjoying the things you do

Alize Kuhn

Solution of an unknown solute in cyclohexane. Freezing-point, Find molality?

5 Answers

AI-Powered Insights

Want to answer this question?

Categories

Tags

Related Questions