9Calculating & 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 ?
10Answer 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) =
11Answer Check Part 2 x(34.97) + (1-x)(36.97)=35.453 Solve for x
12Answer Check Part 3Therefore Cl-35 has a % abundance of 75.85% and Cl-37 has a % abundance of 24.15%
13Problem 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
14Answer Check The atomic mass of nitrogen is 14.00674amu = p( ) + (1 -p)( ) = p p p =p = = 99.63% (N14) 1 - p = = 0.37% (N15)