studying for a midterm and need so much help

You performed an experiment in which you measured the freezing point of pure cyclohexane and the freezing point of 8.30 grams of cyclohexane with 0.213 grams of an unknown solute. The Kf for cyclohexane is 20.5mol"mg. Find the molar mass of the unknown solute using the data below. Be sure to use proper significant figures!! Temperature of NaOH and HCl before reaction 6.41C Temperature of mixture after reaction _ _ 4.02C "Calculate the change in temperature C "Calculate the molality of the cyclohexane/unknown solution "Calculate the mass of cyclohexane solvent in the solution is "notice this is in kilograms! 'Calculate the moles of the unknown. mol " Use the scientific notation methods discussed below!! "Calculate the molar mass of the unknown. g/mol To illustrate scientific notation in your answers, write the significant digits, then type "E", followed by the exponent. An example is: " 2.34103" ", should be typed as " 2.34E3". Another example is 3.47104, should be listed as "3.47E4