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October 30, 2014

October 30, 2014

Posted by **john** on Saturday, February 23, 2008 at 10:52pm.

a) 3.011 x 10^23 atoms F

b)1.50 x 10^23 atoms Mg

c)4.50 x 10^12 atoms Cl

d)8.42 x 10^18 atoms Br

e) 25 atoms w

f) 1 atom Au

can you please explain a and b to me then i'll come back later and see if i did the rest right? Thanks in advance

it needs to be in scientific notation i think.

- chemistry -
**DrBob222**, Saturday, February 23, 2008 at 11:56pm1 mol of anything contains 6.02 x 10^23 of those anythings; therefore, 1 mol of F atoms will contain 6.02 x 10^23 atoms of F. And it will have a mass of 19.0 grams (Look up the atomic mass of F on the periodic table.) So,

3.011 x 10^23 atoms x (1 mol atoms/6.02 x 10^23 atoms) x (19.0 g F atoms/1 mol F atoms) = ?? grams F. Note how the units cancel to give grams at the end.

b,c,d are done the same way.

- chemistry -
**raygene**, Thursday, January 31, 2013 at 5:15pm8.42x10^18

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