Posted by **john** on Saturday, February 23, 2008 at 12:24pm.

what is the mass in grams?

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

- chemistry -
**Jess**, Saturday, February 23, 2008 at 1:13pm
Use stochiometry

a) Molar mass F = 19g/mol

so...

(3.011 x 10^23 atoms F) X (1molF/(6.022 x10^23atoms)X (19g/1mol F) = 9.5 g F

(1molF/(6.022 x10^23atoms) = Avogardro's Law can be used in any situation such as this. Use it for the rest of the questions listed in the same way shown above.

- chemistry -
**john**, Saturday, February 23, 2008 at 1:23pm
but how would the answers by in scientific notations

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