Question

You weigh out a sample of 2.45 grams of fluorine. How many atoms are in your sample? I think I have an idea of how to get it but I wanna be sure

Answer 1

@phi

Answer 2

calculate the number of moles of Fluorine atom then multiply by 6.02 x 10 ^23

Answer 3

ok so 2.45/18.99 g/mol=0.129 mol * (6.02*10^23)

Answer 4

0.129 x 2 x 6.02 x 10^23

Answer 5

ok and is 7.77*10^22 atoms of F correct?

Answer 6

where did the 2 in your equation come from @Ezizio

Answer 7

what u just calculated was the number of F2 molecules

Answer 8

they are asking for the number of F atoms

Answer 9

yes and ! divided yours by 2 and got 7.77*10^22 atoms of F

Answer 10

you need to multiply by 2

Answer 11

2.45 / 18.99 = moles of F2 molecules

Answer 12

(2.45 / 18.99) x 2 = moles of F atoms

Answer 13

yup, and 2.45 / 18.99 = moles of F2 molecules=0.129 mol
0.129 mol* 6.02*10^23=7.77* 10^22 atoms of F

Answer 14

april sages, what you've just calculated is the number of F2 molecules

Answer 15

1 mole = 6.02 x 10^ 23 particles

Answer 16

so you just found out 7.77 x 10^ 22 particles of F2

Answer 17

what do u mean?

Answer 18

no atoms?

Answer 19

they want atom, there is a difference between atom and molecules

Answer 20

ok show me how to get atoms

Answer 21

multiply your answer by 2

Answer 22

so (7.77 x 10^ 22)*2

Answer 23

yes, that is for number of F atoms

Answer 24

so 1.554*10^23 is my final answer?

Answer 25

@Ezizio

Answer 26

yes correct

Answer 27

ty!!!!!!!!!!!!!!!

Answer 28

np