Mass of solid dissolved m1 = 1.35 g Mass of dodecanol m2 = 15 g Freezing point depression Td= 2.34 C Freezing point depression constant for dodecanol K = 2.9 C/mol Calculating the molarity of dodecanol m => Td = K x molarity => 2.34 = 2.9 x molarity => molarity = 2.34 / 2.9 Molarity M = 0.807 We have mass and molarity, calculating for molarity for 15 g solvent = 15 x (0.806 / 1000) = 0.0121 Now calculating the molar mass of solid = m1 / molarity => 1.35 / 0.0121 = 111.538 So the molar mass of the Solid is 111.54
Answer: 8 moles Explanation: Nc2H6= 4 mol 2C2H6 + 7O2 → 4CO2+6H2O CO2=4/2⋅4 NCO2= 8 moles ( I write this on paper so the letters and format might be confusing) sorry!!
