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July 28, 2015

Homework Help: Chemistry again

Posted by Chopsticks on Tuesday, January 6, 2009 at 9:36pm.

Chromium is ametal that is added to steel to improve its resitance to corrosion. Calculate both the number of miles in a sample of Cr containing 5.00 x 10^20 atms and the mass of the sample.

Ok this is how I worked it.

1 mole of Cr = 51.996g = 6.022 x 10^23 atoms

(whatever mass is) 6.022 x 10^23 atom/51.996g = 5.00 x 10^20

After I solved that, I ended up with the mass being 4.32g


Okay now for mole.

4.32g 1 mole/51.996g = .0831 mole

Correct?

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