Question
number 16 please and thank you
15. S mass of the solute? 16. A researcher places 53.2 g of an unknown nonelectrolyte in 505 g uppose that 98.0 g of a nonelectrolyte is dissolved in 1.00 kg of water. The freezing point of this solution is found to be -0.465°C. What is the molecular napthalene. The nonelectrolyte lowers napthalene's freezing point by 83°C. a.What is the molal boiling point constant for carbon tetrachloride? contains 8.10 g of a nonvolatile electrolyte in 300 g of CCl4. It boils at 78.4°C. What is the molar mass of the unknown substance? 17. b. The boiling point of carbon tetrachloride is 76.8. A given solution What is the gram molecular mass of the solute? 18. The molal boiling point constant for ethyl alcohol is 1.22 C/molal. Its boiling point is 78.4. A solution of 14.2 g of a nonvolatile nonelectrolyte in 264 g of the alcohol boils at 79.8. What is the gram molecular mass of the solute? 19 Calculate thea macc nf
Explanation / Answer
dTf = i*Kf*m
DTf = T0-Ts = 8.8 c
i= vanthoff factor of solute = 1
Kf of napthalene = 6.94 c/m
m = molality = (w/M)*(1000/W in g)
= (53.2/x)*(1000/505)
8.8 = 1*6.94*(53.2/x)*(1000/505)
x = molarmass of solute = 83 g/mol
