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Posted by on Monday, September 27, 2010 at 12:03pm.

Copper has two naturally occurring isotopes. Cu-63 has a mass of 62.939 amu and relative abundance of 69.17%. Use the atomic weight of copper to determine the mass of the other copper isotope.

  • chemistry - , Monday, September 27, 2010 at 12:12pm

    fraction*mass + fraction*mass = atomic mass Cu.
    You know fraction and mass of one isotope. Th fraction of the second isotope is 1.00-fraction of first, and the periodic table gives you the atomic mass Cu. Solve for mass of second.

  • chemistry - , Monday, September 27, 2010 at 4:50pm

    Is this for webassign? Cause I had that exact same problem lol does all of the USA use webassign?
    Just wondering

  • chemistry - , Monday, September 27, 2010 at 6:19pm

    well, I live in Indiana, West Lafayette and I am not sure all of the USA use webassign, and yes this is webassign

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