Post a New Question

chemistry

posted by .

This is a lengthy problem, but I really don't understand it. Any assistance given would be greatly appreciated.

An analysis was done on a rock sample to determine its rubidium content. The rubidium content of a portion of rock weighing .350g was extracted, and to the extracted sample was added an additional 29.45 micrograms of rubidium-87. the mass spectrum of this spiked sample showed a rubidium-87 peak that was 1.12 times as high as the peak of rubidium-85. assuming that the two isotopes react identically, what is the rubidium content of the rock (expressed in parts per million by mass)?

additional info:
rubidium-87 atomic mass=86.909u
% natural abundance=27.83% of all rubidium
rubidium-85 atomic mass=84.912u
% natural abundance=72.17% of all rubidium

I am particularly confused by the peaks aspect of this problem. Does that mean like something with mass or what? Please help. Thanks.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

More Related Questions

Post a New Question