In an atom where is the electon located?

3.08 m

Explanation:

To calculate the molarity, you have to use the following formula:  

From the question, we already have the mass of the solvent (benzene); However, for the calculation of molality, we require the solvent in Kg, therefore we do the conversion from g to kg:  

125 g of benzene = 0.125 kg of benzene.  

To obtain the number of moles of solute we have to use the molecular weight of toluene, which is 92.14  

To convert from g to moles, we divide the grams of toluene by the molecular weight:  

Therefore, we have 0.386 moles of toluene.  

The last step will be to replace all the values in the molality formula:  

= 3.08 m

I hope this clarifies your inquiry.