Anonymous

# aa solution of toluene(92.1 weight) in benzene(molecular weight 78.1) is prepared the mole fraction of toluene

in the solution is .100. what is the molality of the solution?

A. .100 m

B. .703m

c. .921 m

D. 1.28 m

E. 1.42 m

Relevance

Since the Mole Fraction of Toluene is 0.1 the mole fraction of benzene should be 0.9.

they should be proportionate.assume the total number of moles to be equal to 1.

Molality = No of moles of solute/ Wt of Solvent in K.G

No of moles of Solute(toulene)=0.1

Wt of Solvent(Benzene) =0.9*78(in grams) or 0.9*78/1000(in K.G)

Substituting the values in given equation we get molality of the solution as 1.42m

therefore the correct answer is E

• finnen
Lv 4
4 years ago

Benzene Molecular Weight

• Anonymous
6 years ago

RE:

Aa solution of toluene(92.1 weight) in benzene(molecular weight 78.1) is prepared the mole fraction of toluene

in the solution is .100. what is the molality of the solutio

Source(s): aa solution toluene921 weight benzenemolecular weight 781 prepared mole fraction toluene: https://knowledge.im/?s=aa+solution+toluene921+wei...
• Erika
Lv 4
4 years ago

Toluene Molecular Weight

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• 5 years ago

0.1 mol solute/0.1+0.9, so 0.9 mol solvent x78.1 g/1000 g= 0.07 kg solvent molality=mol solute/kg solvent

so 0.1 mol solute/0.07 kg solvent = 1.428 m