I need help in this???

Question

anonymous · Answer

The answer is already marked in the red box, my my question is:
why??? why not C?

aaronq · Answer

$NH_4NO_3$ can b separated into $NH_4^+$ and $NO_3^-$

for the nitrate ion, this needs to hold because the charge is negative one

-1=N+(-2)*3, so N=+5

In $N_2O$ the N atom is +1

so change from +5 to+1 is -4

anonymous · Answer

wait N2O

anonymous · Answer

I don't get the charge of N2O

anonymous · Answer

@aaronq

aaronq · Answer

O=-2, this needs to hold because its neutral,  0=-2+2N, N=+1

anonymous · Answer

Oooh ok and for NO3 it's going to be +6? for N?

anonymous · Answer

OooooOOOOoooo!!! Okayyy I got now!

aaronq · Answer

no, recall that there is an overall -1 charge on the ion.  -1=N+3(-2),  N=+5

anonymous · Answer

No no @aaronq  I made a mistake there I did not see the negative charge (-1)

somy · Answer

@aarong from NH4+ to N2O its gonna be +4 change and from NO3- to N2O is gonna be -4 change 
is it like that? or am i getting it wrong?

somy · Answer

@aaronq

aaronq · Answer

yeah N in NH4^+ is -3, so to get to +1, you remove 4 electrons, hence a change of +4.

somy · Answer

thaaaaanks!!! @aaronq we get it now :D

anonymous · Answer

Now I got it 100% thank you :)
@aaronq  @Somy

aaronq · Answer

no problem guys!