Show your numerical set-up, including units, and give the answer with its units and proper # significant figures. Periodic table molar masses should use atomic weight to 2 decimal places. Use Avagadro's # factor if the "number of particles" is involved. 1. An open empty metal paint-thinner can under 1.00 atm pressure is heated to 712 degrees C over a flame, then is capped air-tight and allowed to cool back down to 22.0 degrees C. Find the new pressure inside the can before it collapses. Convert degrees C to Kelvin: 712 degrees C + 273 = 985 K 22.0 degrees C + 273 = 295 K Cross multiply: Use this balanced equation for the next problems: N2 (g) + 3H2 (g) -> 2NH3 (g) (if no P, V, & T, assume STP) 1. Find the volume of hydrogen needed to produce exactly a trillion molecules of ammonia. Use Avagadro's number to solve: 2. Find the volume of ammonia that will be produced at 727 torr and 25 degress C from 42 g of nitrogen. Ideal Gas Law: (P)(V) = (n)(R)(T): (see turbogor's post) Mass of N2 in grams = 28.02 (rounded to nearest 100th) First, find the value for "n": Then plug in the values using pV = nRT
