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Chemistry problem help
Posted: Sat Sep 20, 2008 7:23 pm
by nitrofreez
So I've gotten some homework for chemistry, and the last question is:
How many molecules (not moles) of NH3 are produced from 6.42×10^−4 g of H2?
Chemical formula: 3H2 (g) + N2 (g)---> 2NH3 (g)
I've been trying this problem for a while but I still can't get it. So,my question is, how would I go about solving this problem? Any help is much appreciated.
-Nitro
EDIT: It's 6.42×10^−4 not 10-4, sorry. Thanks crazy.
Re: Chemistry problem help
Posted: Sat Sep 20, 2008 7:38 pm
by ThiefzV2
5.56x10^20
Re: Chemistry problem help
Posted: Sat Sep 20, 2008 7:43 pm
by crazyskwrls
ThiefzV2 wrote:5.56x10^20
i beg to differ, 1.28*10^20
6.42×10−4 g
i guess this is supposed to be 6.42×10
^−4 g
Re: Chemistry problem help
Posted: Sat Sep 20, 2008 7:57 pm
by ThiefzV2
6.42×10−4 g
i guess this is supposed to be 6.42×10^−4 g
yes thats what he meant
crazyskwrls wrote:ThiefzV2 wrote:5.56x10^20
i beg to differ, 1.28*10^20
No
Re: Chemistry problem help
Posted: Sat Sep 20, 2008 7:57 pm
by nitrofreez
Incidentally, would you be able to explain to me how you got the answer Crazy? You were right but I'd like to know how you did it for future reference
Re: Chemistry problem help
Posted: Sat Sep 20, 2008 8:09 pm
by crazyskwrls
ThiefzV2 wrote:6.42×10−4 g
i guess this is supposed to be 6.42×10^−4 g
yes thats what he meant
crazyskwrls wrote:ThiefzV2 wrote:5.56x10^20
i beg to differ, 1.28*10^20
No
pwned
6.42×10^−4 g
H2 has molar mass of 2
6.42×10^−4 g/2 =
3.21×10^−4 mol of H2since according to the equation for every 3 mol of H2, 2 mol of NH3 is produced so
3.21×10^−4 mol of H2 * (2/3) =
2.14*10^-4 mol of NH3avogadro's number is 6.02*10^23
2.14*10^-4 mol of NH3 * 6.02*10^23 = 1.28*10^20
Re: Chemistry problem help
Posted: Sat Sep 20, 2008 8:17 pm
by nitrofreez
I put in his answer and it came up as correct mate. I tried your answer too but it was wrong.
Thanks, a lot mate. Really appreciate it
Re: Chemistry problem help
Posted: Sat Sep 20, 2008 8:17 pm
by SM-Count
Crazy has the correct answer but the wrong explanation. You never use H2 to calculate molar mass, you use H with 1g, but the conversion ration 6 moles of hydrogen to 2 moles of ammonia.
Re: Chemistry problem help
Posted: Sat Sep 20, 2008 8:18 pm
by ThiefzV2
well it was worth a try
crazy, do my HW too plz
Re: Chemistry problem help
Posted: Sun Sep 21, 2008 4:42 am
by Ashikiheyun
Lord how I do NOT miss chemistry at all.
