atomicmass of2 stable isotopesof C,126C ( 98.90 percent)and 136C(1.100 percent),are12.0000 amuand13.0034 amu.Calculateaverageatomicmass of C?
- Roger the MoleLv 78 months ago
[This is not a question about Languages. It needs moving to All Categories > Science & Mathematics > Chemistry .]
"atomic mass of 2 stable isotopes of C, 126C ( 98.90 percent) and 136C (1.100 percent), are 12.0000 amu and 13.0034 amu. Calculate average atomic mass of C."
(0.9890 x 12.0000 amu) + (0.01100 x 13.0034 amu) = 12.01 amu
[Note that the method used above only works when the given percentages add up to exactly 100%.]