9 Calculating & Abundance Chlorine has two isotopes: chlorine-35 (mass amu) and chlorine-37 (mass amu).What is the percent abundance of these two isotopes if chlorine's atomic mass is ?
10 Answer Check Part 1if 2 isotopes, then the total is 100%. assume one is x% (x), the other is automatically 100-x%, (1-x)x(34.97) + (1-x)(36.97) =
11 Answer Check Part 2 x(34.97) + (1-x)(36.97)=35.453 Solve for x
12 Answer Check Part 3Therefore Cl-35 has a % abundance of 75.85% and Cl-37 has a % abundance of 24.15%
13 Problem 1The two naturally occurring isotopes of nitrogen are nitrogen-14, with an atomic mass of amu, and nitrogen-15, with an atomic mass of amu. What are the percent natural abundances of these isotopes?The atomic mass of nitrogen is amu
14 Answer Check The atomic mass of nitrogen is 14.00674amu = p( ) + (1 -p)( ) = p p p =p = = 99.63% (N14) 1 - p = = 0.37% (N15)