9-A 150 g aqueous solution contains 18.5 g of NaCl and 76 g Glucose (C6H121 1206). What is the mole fraction of the NaCl in the solution? The molecular weight of NaCl and Glucose are 58.45 g/mol and 180.2 g/mol respectively. a) 0.05 b)0.0016 c) 0.24 d) 0.083 10- What is the freezing point of an aqueous solution of glucose (C6H1206) that contains 105 g of glucose and 850 g of water (freezing point depression constant of water is 1.86 C/m and water freezing point is 0.0C at 1 atm ) a) -1.28 C b) - 0.00186 C c) -1.86 C d) 3.72 C 11- The combustion reaction of ethane with oxygen in the gaseous state is: C2H6(g) + "/2O2(g) 2C02(g) + 3H2O(g) At the start of such a reaction, the concentration of CO2(g) is 0.0 M. After 0.082 seconds the concentration is observed to be 0.0085 M CO2(g). What is the general rate of reaction? 12- A 7.5 m KNO3 aqueous solution contains a) 7.5 g of KNO3 in 1.00 L of solution b) 7.5 g of KNO3 in 100 mL of water 7.5 mol of KNO3 in 1.00 kg of water 7.5 mol of KNO3 in 1.00 kg of solution c) d)