- 34 What Mass Of Water Is Required To Dissolve 25 31 G Of Potassium Nitrate Kno3 To Prepare A 0 3982 M Solution Molar 1 (98.4 KiB) Viewed 56 times
34. What mass of water is required to dissolve 25.31 g of potassium nitrate (KNO3) to prepare a 0.3982 m solution? Molar mass of KNO3 is 101.1 g/mol. A) 100.8 g B) 627.8 g C) 9.96 x 102 g D) 356.4 g 35. How many joules of heat must be added to melt 150 grams of ice, assuming that initial temperature of ice was 0°C? Heat of fusion of water is 334 J/g? A) 5.0 x 104 J B) 449 J C) 2.23 J D) 4.5 x 102) Written response questions. Number of points vary. You must write entire solution with units and correct number of significant figures to receive full credit for these questions. For numerical answer only you will get 1 pts. 36. Solution of methanol (CH3OH, molar mass = 32.04 g/mol), has molality of 97.6 m and the density of solution is 0.858 g/mL. What is the molarity of this solution? H2O is the solvent. (4 pts) - 0,484 ml 37. What is the percent by mass of NaCl in a 2.50 molal aqueous NaCl solution? Molar mass of NaOH is 58.44 g/mol. (4 pts) 38. What is molarity of 15% solution of KCl, if density of this solution is 1.10 g/mL? (4 pts)