Answer to Question #181298 in General Chemistry for Joshua

Question

Solve the following problem set.

Problem Set

1. Calculate the mole fraction of the solute in the following solutions.

 a) 100g C2H6O in 100g H2O

 b) 30% HCI solution by mass

2. A solution us prepared by mixing 1g of ethanol ( C2H6O) with 100g water to give a final volume of 101 ml. Calculate the mole fraction for the solute and solvent,and the molarity of ethanol in the solution. 

Answer 1

Moles C2H6O. = $\frac{100}{46}=2.1739$

Moles of H2O= $\frac{100}{18}=5.5556$

Total moles

$$= 5.5556+2.1739=7.7295$$

% = $\frac{2.1738}{7.7295}×100=28.12$ %