91影视

To calculate molality and mole fraction, we will need to determine the number of moles of each component in the solution. The molecular mass of phenol (C鈧咹鈧匫H) is: C: 6 atoms 脳 12.01 g/mol = 72.06 g/mol H: 6 atoms 脳 1.008 g/mol = 6.048 g/mol O: 1 atom 脳 16.00 g/mol = 16.00 g/mol Total molecular mass = 94.108 g/mol The number of moles of phenol is given by: Phenol moles = \(\frac{\text{mass}}{\text{molar mass}} = \frac{25.5 \text{ g}}{94.108 \text{ g/mol}}\) The molecular mass of ethanol (C鈧侶鈧匫H) is: C: 2 atoms 脳 12.01 g/mol = 24.02 g/mol H: 6 atoms 脳 1.008 g/mol = 6.048 g/mol O: 1 atom 脳 16.00 g/mol = 16.00 g/mol Total molecular mass = 46.068 g/mol The number of moles of ethanol is given by: Ethanol moles = \(\frac{\text{mass}}{\text{molar mass}} = \frac{425 \text{ g}}{46.068 \text{ g/mol}}\) Calculate the number of moles of phenol and ethanol.

To calculate the mole fraction of phenol (蠂鈧氠担鈧戔倣鈧氣倳鈧戔倷鈧掆倵鈧�), we will use the formula: Mole fraction of phenol = \(\frac{\text{moles of phenol}}{\text{total moles in the solution}}\) 蠂鈧氠担鈧戔倣鈧氣倳鈧戔倷鈧掆倵鈧� = \(\frac{\text{moles of phenol}}{\text{moles of phenol} + \text{moles of ethanol}}\) Calculate the mole fraction of phenol using the previously calculated values of moles of phenol and ethanol.

To calculate the mass percentage of phenol, we will use the following formula: Mass percent of phenol = \(\frac{\text{mass of phenol}}{\text{total mass of the solution}} 脳 100\%\) Total mass of the solution = 25.5 g (phenol) + 425 g (ethanol) Calculate the mass percent of phenol using the given masses and the total mass of the solution.

To calculate the molality (m) of phenol, we will use the following formula: Molality = \(\frac{\text{moles of phenol}}{\text{mass of ethanol (solvent) in kilograms}}\) Convert the mass of ethanol to kilograms: 425 g 脳 \(\frac{1 \text{ kg}}{1000 \text{ g}}\) Calculate the molality of phenol using the previously calculated moles of phenol and the mass of ethanol in kilograms.