Homework Help: Chemistry

Posted by Joe on Sunday, October 14, 2012 at 12:05am.

I need to find the average molar mass of an unknown element. The atomic mass is 120; the mass numbers of isotopes are 295, 296, 297, 298 and 299; the percent of each isotope is 2.356%, 4.325%, 15.652%, 48.452% and 29.215%. The mass of the neutron is 1.67262164x10^-24g and the mass of a proton is 1.67492721x10^-24g. The mass defect is 0.76132613%.

Chemistry - DrBob222, Sunday, October 14, 2012 at 12:50am
Have you looked at my answer below?
http://www.jiskha.com/display.cgi?id=1350184766

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