i am new in chemistry...so i am not very understand..
Everyone is new, to everything, at some point. You are also new to these forums, so I have to tell you something important -- forum rules specify that you have to show some effort. We can't just give you answers.
First off, it's cheating, and your school could very well track us down, and at least complain to Mitch, if not do even worse to him, and end up shutting down the board.
Second of all, it's better for you, if you learn yourself, so you'll be ready for anything, when exam time comes and, almost important, in your real life chemistry career, when the problems come up again.
Besides which, answering the same, very simple question, over and over again, is dull for us. We really don't want to field questions form everyone in your class, "I mixed these, now what. And these, now what. And this. And this. Oh, and this." It's just tiring, and in the end, doesn't make this board a better place for others to learn.
Here's something we can all do, click on you name, and see all your posts (even when you post randomly in a different thread, which also isn't very helpful): http://www.chemicalforums.com/index.php?action=profile;u=24714;sa=showPosts
Print them out, and see, what is your real question, what do you know, and what do you not know. And how can you pull the knowledge together, to learn what you need to know.