[uchiness]

i know ive posted a lot of questions, i just really need a lot of help x.x and this is my last one, and again step by step answers will be highly grateful.

[Arkcon]

Four questions aren't a lot, so don't worry about that.  But you seem to have missed the Forum Rules, and you should read and follow them.

http://www.chemicalforums.com/index.php?topic=33740.0

We don't give full and complete step by step answers with all the work.  So you can just forget that right away.

We like to give hints, you start with some work, we give suggestions, and you learn some steps you missed and come up with some answers on your own.

And don't just scan the questions into an image.   You may not be able to solve the problem, but you should try to figure out -- what info you need, what formulas from your book to use, and should be coping that data out.  You have done zero work. That is just insulting.