chemisty help please...

[alfa147x]

How many atoms are in each of the following samples?

(a) 50.3 g Li
____ atoms
(b) 0.171 g Pb
____atoms
(c) 11.9 g Hg
____atoms
(d) 57.4 g Si
____atoms
(e) 0.135 kg Ti
____atoms


Thanks alot

 

[Lonyo]

Do your own homework.

 

[alfa147x]

every time i try #1 i get it wrong i got 4.36319885*10^24 for a and it says its wrong
HELP!

 

[Toastedlightly]

well, remember your conversions.

How many moles are in that # of grams?
How many atoms are in those moles?

 

[alfa147x]

Originally posted by: Toastedlightly
well, remember your conversions.

How many moles are in that # of grams?
How many atoms are in those moles?

well for letter A i got 4.36319885*10^24

Is that right?

 

[Toastedlightly]

Originally posted by: alfa147x

Originally posted by: Toastedlightly
well, remember your conversions.

How many moles are in that # of grams?
How many atoms are in those moles?

well for letter A i got 4.36319885*10^24

Is that right?

no clue, but look for significant figures (most chem instructors I know make good use of them )

 

[theMan]

yes, thats right. but, the correct answer, with sig figs, is 4.36x10^24 atoms.

 

[Kevin1211]

heres a big hint: avogadro's number...


use stoichemistry and go from there...

 

[ImDonly1]

I got same answer as you, I say your book is wrong... what does it say the answer is anyway?

 

[theMan]

yeah, what does the book say?

 

[Stunt]

How is that 3 problems?

 

[Midlander]

Originally posted by: theman
yes, thats right. but, the correct answer, with sig figs, is 4.36x10^24 atoms.

Ding ding ding. :beer:

 

[alfa147x]

ok thanks alot, i figured the other 2 out!