[QUOTE="MuffinsKill"]1. how is the atomic mass of an element on the periodic table found?
2. how do you determine mass percent?
3. How do you determine empirical formulas?
4. how do you determine molecular formulas (2methods) ?
5.How do you do a limiting reactant problem?
thanks in advance! :]
Yagami-Iori
1) Count the amount of elements above it. If it's at the top, it has no weigh and therefore doesn't exist. 2) Divide that number from 1 by the amount of elements below it. The bottom elements have a 100%, because if you divided by zero, the world ends with you. 3) Look for a crown 4) If you can't see the formula, get a microscope. If you can see it now, it's a molecular formula. 5) Stick a paper clip in an outlet with your hands. Do it now.That isn't very nice now Yagami :P
1. Atomic mass is the average mass of all types of atoms of an element. It is found below the atomic Symbol on the table.
2. Do you mean like composition/concentration of quantaties in a mixture? This is quite a long thing to explain. More in depth examples can be found on the internet.. Heres a good one; http://chemistry.about.com/library/weekly/aa030503a.htm
3. Empirical Formulas deal with ratios E.g. CH20. For each C atom in this compound there are 2 H atoms and 1 O atom.
4. The molecular formula shos the actual number of each type of atom present. I will use the same compound as before; E.g. C2H4O2
5. Again you will have to go through a few steps. But just know that the limiting reagent is the chemical with less moles than a reaction requires.
Read through these problems and make sure to try and do them yourself or you're not getting anywhere. http://chemistry.about.com/library/weekly/bl061703a.htm
What grade are you in if you truly need help don't be afraid to ask the teacher if you're struggling. Do some extra catch up work.
I've had chem all day :( lol I hate when it includes maths :P
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