[PWillis]

My class is doing an experiment on a fictional element called "cornium". I had to make a data table.... did I do it correctly?

I have 3 packets of "cornium": 1.66g (3 kernals) of white cornium, 2.8g (6 kernals) of yellow cornium, and 1.11g (5 kernals) of popcornium.

Cornium Data Table:
                                                                           
Sample   Mass   Quant.   Avg. Mass   Relative Abundance  Relative Weight
-----------------------------------------------------------------------------------------------------

Wht Corn 1660   3             553.3       21.42                 11851.68

Yllw Corn 2800   6             466.6        42.85                 19993.81

Popcorn   1110   5             222          35.71                 7927.62

Total:      5570   14            397.85    99.98                 39777.04

[mrdeadman]

I think your relative abundance is off. Somebody correct me if I'm wrong, but don't you do for the first one 1660/5570 which gives 29.8 percent?

[PWillis]

I think your relative abundance is off. Somebody correct me if I'm wrong, but don't you do for the first one 1660/5570 which gives 29.8 percent?

I think you are correct. Here is the formula that was given to determine the abundance:

Relative abundance:   number of particles of corn / total number of particles of all isotopes

For some reason I thought that quantity=number of particles, so I calculated for example 3 (white corn) / total quantity of 14, giving 0.21 x 100= 21.42. I made the same error in calculation for each corn.

But as you pointed out, mass= the number of particles. So then of course it is 1660/5570= 0.29 x 100= 29.8.

Thank you very much for your *delete me* Hopefully I will get the hang of this chemistry class and actually be able to post here and help someone too.

[mrdeadman]

Sure man. You stick around here and you can get all sorts of help.