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Topic: mol?  (Read 4563 times)

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Offline 1c2h3e4m

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mol?
« on: October 21, 2007, 07:45:55 PM »
Question:


Calculate the mass in grams:

1)  1.38 mol N

2)  6.022 X 10^23 atoms of Ag

3)  2.57 X 10^8 mol S

Calculate the number of atoms present:

1)  2 mol Fe

2)  40.1 g Ca

3)  4.5 mol boron-11



I was reading in the book and its so confusing, i dont understand how to use mole and Avogadros number.  Help please.
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Offline 1c2h3e4m

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Re: mol?
« Reply #1 on: October 21, 2007, 08:18:33 PM »
I kept reading and i did everyone and i hope there right and if someone is nice enough to do them i could check, and just to show u im not scamming you for answers ill show what i got for the first one


19.338 g N

hopefully its right, if not then o well...
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Offline DevaDevil

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Re: mol?
« Reply #2 on: October 21, 2007, 08:22:36 PM »
that is correct
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Offline 1c2h3e4m

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Re: mol?
« Reply #3 on: October 21, 2007, 08:42:08 PM »
o good, could u help me with the last one where it says -11? i dont understand that
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