Thursday

January 29, 2015

January 29, 2015

Posted by **Jane** on Monday, February 15, 2010 at 2:42pm.

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.

**Answer this Question**

**Related Questions**

Chemistry - Analysis of Tap water (Hardness) Was analyzed by a complexometric ...

Calculus - How do you simplify the sqrt of z^2 + 5. Any assistance would be ...

Calculus - Find a formula for the derivatives of the function m(x)=1/(x+1) ...

Physics - A 69 kg roller blader, is on a frictionless surface at rest, he then ...

Algebra II - How would you go about doing this problem? I've tried and with the ...

Chemistry - Complete combustion of 7.70 g of a hydrocarbon produced 23.7 g of ...

Alegbra - who ever will help me I do not understand this problem? Solve each ...

Math - I posted this problem the other day and someone answered it but when I ...

Discrete Math - Let g(x)=3x^2+14x-15. Determine if g is one to one or onto. A. g...

Chemistry - An equilibrium that would favour the products is A. NH4+(aq) + H2PO4...