[Rodeocrazy1]

I am having trouble balancing chemical formulas.  I get some but  the ones like  N + H  reacting to  NH3    equalling N2 + 3H2  = 2NH3  I do not understand how this works.  Can someone please explain.  Cj

[Mr T]

have a look at the periodic tabe, N is in the 5th column. That means N has 5 valence electrons. So to obey the octet rule it has to gain ( share in this case) 3 electrons from 3 H atoms.

[Borek]

I am having trouble balancing chemical formulas.  I get some but  the ones like  N + H  reacting to  NH3    equalling N2 + 3H2  = 2NH3  I do not understand how this works.  Can someone please explain.  Cj

You mean formulas or reaction equations?

[AWK]

You can solve this problem in pure algebraic way counting atoms.
a(2N) + b(2H) = c(N+3H)
You should solve the problem in integers.
Putting tentatively a=1 we have 2=c and 2b=3c from which b=3.
Finally chemical equation (in molecules)  should be:
N2 + 3H2 = 2NH3

or analogously:
putting b=1 we have 2=3c => c=2/3 and a=1/3
(1/3)N2 + H2 = (2/3)NH3
and finally
N2 +  3H2 = 2NH3

and so on