A sample of 10.5 g of nitrogen reacts with 20.2 g of hydrogen to produce ammonia. I need help on a-e. If you can explain know any, doesn't have to be all, that would be a great help! Please no files or links, thank you!

An aqueous solution of hydroiodic acid is standardized by titration with a 0.186 m solution of calcium hydroxide. if 26.5 ml of base are required to neutralize 20.3 ml of the acid, what is the molarity of the hydroiodic acid solution? m hydroiodic acid

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added