What is the concentration, in m/v percent, of a solution prepared from 50. g NaCl and 2.5 L of     water?

✓ Question Completion Status: Which aqueous solution has the lowest freezing point? (Assume complete dissociation for electrolytes) O a. 0.10 m HCI O b.0.10 (NH4)2S O c. 0.20 m C₂H5OH O d. 0.20 m K₂SO4 Ⓒe.0.20 Fel3 QUESTION 3 What is the freezing point of a solution prepared from 45.0 g ethylene glycol (C2H602) and 85.0 g H2O? Kf of water is 1.86°C/m. O a.-15.9°C Ob. 15.9°C Oc.-159°C O d.-1.50°C O e. 1.50°C QUESTION 4 A 29.90 g sample of an unknown substance (nonelectrolyte) is mixed with 250.0 g of stearic acid. The freezing point depression was 6.7°C. Calculate molar mass of the unknown substance. kf of stearic acid is 5.1°C/m O 155 6 almol Click Save and Submit to save and submit. Click Save All Answers to save all answers. 2.5 pol Sav

Please answer number 7, letters d and e only. Thank you

Calculate the percent concentration by mass (% m/m) of a solution prepared by combining 43.44 grams of NaF with 1156.56 grams of H2O.    a. 2.62%   b. 6.62%   c. 6.32%   d. 3.62%