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OpenStudy (anonymous):
this site is confusing
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OpenStudy (anonymous):
is it now :(
OpenStudy (anonymous):
can i help?
OpenStudy (anonymous):
youll get used to it
OpenStudy (anonymous):
i need help on a chem question but there is no chemistry study :P
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lol just put it here :)
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OpenStudy (anonymous):
what is the percent abundance of copper-65 and copper-63 if the atomic mass is 63.546amu and the exact masses of the isotopes are (63) Cu=62.93amu, and (65) Cu=64.93 amu. assume no other isotopes exist.
OpenStudy (anonymous):
........................................
OpenStudy (anonymous):
see? its impossible
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