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# chemistry help watch

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1. calculate the mass in grams of a single atom of sodium

Ok so i did moles=6.02x10^23 / 23= 2.617391304x10^22 is this right?
2. moles = mass/mr rearrange
the equation would be moles * mr so it should be 6.02x10^23 * 23
hopefully i'm right :/
4. (Original post by Azurefeline)
no, but i don't know how to do it
5. it is:

Avogardos number/23 to find moles and then moles * Mr to get mass.

Give that ago and then let me know what you get please!
6. (Original post by kandykissesxox)
no, but i don't know how to do it
Ok, so you answered "am I right".

Now, molar mass is the weight of one mole of that type of atom. And you need to find out the weight of a single one of those atoms. Remember that 1 mole is just a number (albeit very large). What are you thinking now? Do you have an idea, or the answer?
7. (Original post by Azurefeline)
Ok, so you answered "am I right".

Now, molar mass is the weight of one mole of that type of atom. And you need to find out the weight of a single one of those atoms. Remember that 1 mole is just a number (albeit very large). What are you thinking now? Do you have an idea, or the answer?

ok so would you do 6.02x10^23 is 23g therefore 23/6.02x10^23 = 3.8205x10^23
8. (Original post by kandykissesxox)
ok so would you do 6.02x10^23 is 23g therefore 23/6.02x10^23 = 3.8205x10^23
That's exactly what I would do, but double check the answer to your calulation (sense check - is that plausible?) I think you probably mis-typed though
9. (Original post by Azurefeline)
That's exactly what I would do, but double check the answer to your calulation (sense check - is that plausible?) I think you probably mis-typed though

calculate the number of oxygen molecules that react with 2.6g of sodium.

I have done so far: moles= 2.61/23
moles=0.1134782609

then plugged it into the avagadro equation so the moles x 6.02x10^23
am i taking the right steps?
10. Atomic mass/6.02x10-23

23/6.02x10-23 = 3.819x10-23 grams
11. (Original post by TajwarC)
Atomic mass/6.02x10-23

23/6.02x10-23 = 3.819x10-23 grams

a bit late haha
12. (Original post by kandykissesxox)

calculate the number of oxygen molecules that react with 2.6g of sodium.

I have done so far: moles= 2.61/23
moles=0.1134782609

then plugged it into the avagadro equation so the moles x 6.02x10^23
am i taking the right steps?
Important things to consider: an oxygen molecule is not an oxygen atom. Writing out the equation for the reaction of sodium and oxygen will help with balancing as well

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