need chemistry help fast!

[cracked]

could someone please help me balance these three equations? i have to have it done by 12:00 tonight. im desperate!

1) [a]H3PO4 + [b]KOH -> [c]K3PO4 + [d]H2O

2) [a]N2O5 + [b]H2O -> [c]HNO3

3) [a]Al + [b]H2O -> [c]Al(OH)3 + [d]H2

the answers i got for the coefficients are:

1) 2, 6, 2, 6

2) 2, 2, 4

3) 8, 24, 8, 12


as far as i can tell, these are right, but my homework thing says they are wrong. my chemistry hw is done online and it tells you when you get it wrong and you get a chance to make it up. can someone at least point out to me what is wrong with these?

thanks!

drew

[GlArP]

Originally posted by cracked
[B]could someone please help me balance these three equations? i have to have it done by 12:00 tonight. im desperate!

1) [a]H3PO4 + [b]KOH -> [c]K3PO4 + [d]H2O

2) [a]N2O5 + [b]H2O -> [c]HNO3

3) [a]Al + H2O -> [c]Al(OH)3 + [d]H2

the answers i got for the coefficients are:

1) 2, 6, 2, 6

2) 2, 2, 4

3) 8, 24, 8, 12


as far as i can tell, these are right, but my homework thing says they are wrong. my chemistry hw is done online and it tells you when you get it wrong and you get a chance to make it up. can someone at least point out to me what is wrong with these?

thanks!

drew

This is way over my head, sorry. My father might know.

[Prexaspes]

1, 3, 1, 3
1, 1, 2
1, 3, 1, 3

See what you did wrong?

Reduce the coefficients!

[cracked]

so in theory i had it right i just have to reduce them?

im in freshman chem and i havent done any chem since sophmore year in hs so im a bit rusty. thanks prexaspes! your a lifesaver!

drew

[ben-the-slacker]

Yes, if all #s can be reduced, they must be. So go with Prexaspes's answers. Take a look at #3, you messed up with the H2O and H2 balance.

[Prexaspes]

Wow! I missed that...

Last one should be 2, 6, 2, 3