Grams and mass

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I cant figure this problem out at all

nitrogen and hydrogen gases react to make ammonia. A closed, rigid cylinder contains a total of 0.750 mol of gas at 25 degrees C and 1.10 atm before the reaction takes place; the mole ratio of hydrogen to nitrogen in the cylinder is 3:2. Determine the temperature and the pressure of the gas in the cylinder at the end of the reaction. The assumptions: The cylinder walls neither absorb nor release heat. Neither the temperature nor the pressure remain constant. Otherwise, make any assumptioins necessary to solve the problem.

K values

I have the following problem where the gas phase decomposition of HI into H2 and I2is found to have Ea = 182 kj/mol. The rate constant at 700 degrees Celcius is 1.57 X 10 -3 M/s. I have to find the value of k at two separate temperatures (i.e. 600 degrees Celcius). How do I go about setting this problem up so that I can solve for k?

Calculating % ionization

A 0.600m aqueous solution of a weak acid HX has a freezing point of -1.28 degrees C. Calculate the % ionization of HX. Kf H2O= 1.86 m= molality Step-by-step, how can % ionization be calculated using this information? What formula's or stoichiometry is involved?

using dimensional analysis to determine speed vs. time

Step 1: A 240 horsepower car beginning at a stop goes 1/10 of a mile. At optimum performance, what is the maximum speed in miles per hour the car can reach? Feet per minute? Step 2: How many feet have been traveled in a 240 horsepower car when the speed reaches 35 MPH at optimum performance? what fraction of a mile is that distance? If any additional info is needed to answer problem let me know what it is so I can provide it.