Recent content by coffee

Thanks for helping everyone. A friend and my teacher showed me how to do it. I get it now. :D

I still don't understand how to solve it. I think I need a work out form instead of a written explanation. Sorry, I'm slow :'( I don't think I've learned this last year either.. maybe something similar but easier.

Oops, sorry for putting it into the wrong section >o< Um for the first two I'm not really sure but does it has anything to do with multiplying the percent with the amu then add them together? Lol, I really forgot this ..either that or my last teacher taught something simililar to this but it...

Just came back to school.. and I realize I've forgotten so many things! :cry: ARGG! >_< So if anyone can, I would really appreciate it you could help and show me how to do these problems asap!1) An element consists of 1.40% of an isotope with mass 203.973 amu, 24.10% of an isotope with mass...