Register to reply 
Finding mass based on amu and % abundance 
Share this thread: 
#1
Sep2408, 07:27 PM

P: 2

1. The problem statement, all variables and given/known data
Oxygen has 3 isotopes. Oxygen16 has the amu of 15.995 and its natural percent abundance is 99.759. Oxygen17 has a mass of 16.995 amu and its natural percent abundance is 0.037. Oxygen18 has a mass of 17.999 amu and its natural percent abundance is 0.204. What is the average atomic mass of oxygen? 2. Relevant equations I think I forgot these... 3. The attempt at a solution I couldn't remember what the process is supposed to look like to figure this sort of problem out, so I tried to multiply the mass by the percent abundance, but the answers made very little sense. If somebody could help me figure out where I messed up, PLEASE RESPOND! 


#2
Sep2408, 08:00 PM

HW Helper
PF Gold
P: 2,841

The average atomic mass of an element is much like a simple mixture problem that you learn in first year Algebra such that you can resort directly to percentage contributions formula.
AverageAMU = 0.99759*16 + 0.00037*17 + 0.00204*18 


#3
Sep2408, 09:19 PM

P: 2

Thank you so much!



Register to reply 
Related Discussions  
Help with p.s.i. impact equation based on velocity, area and mass?  Introductory Physics Homework  11  
Finding charge based on net force and other charges  Introductory Physics Homework  9  
Finding Jacobian based on endeffector orientation instead of position  Calculus  0  
Finding distance based off acceleration  Introductory Physics Homework  12  
Why isn't freefall based on the mass of the object falling?  Special & General Relativity  23 