Please Answer all four. Thank you!

1. What is the freezing point of a solution of 5.23gMgCl in 100g of water? Kf for water is 1.86C/m. Report your answer in C. 2. The decomposition of dinitrogen pentoxide is described by the following chemical equation 2N2O5(g)4NO2(g)+O2(g) If the rate of disappearance of N2O5 is equal to 3.29mol/min at a particular moment, what is the rate of appearance of NO2 at that moment? 3. A particular first-order reaction has a rate constant of 1.35102s1 at 25.0C. 4. Hydrogen iodide decomposes at 800K via a second-order process to produce hydrogen and iodine according to the following chemical equation. 2HI(g)H2(g)+I2(g) At 800K it takes 63.1 seconds for the initial concentration of HI to decrease from 9.45102M to 0.0169M. What is the rate constant for the reaction at this temperature? Include units in your