. Nitrogen is unique in that it forms no fewer than seven molecular oxides. The one of highest molar mass
is dinitrogen pentoxide, N
2
O
5
, a crystalline, colorless solid made by the reaction of nitric acid (HNO
3
) with
P
4
O
10
.
HNO
3
(
l
) + P
4
O
10
(s)
Þ
N
2
O
5
(s) + HPO
3
(s)
a. Balance the equation (2 p
ts).
b. Using
15.07 g of P
4
O
10
and 10.67 g of HNO
3,
how many grams of N
2
O
5
could
you get
?
You would do well to post your questions as we USUALLY read them. Your posts are difficult to decipher.
4HNO3 + P4O10 ==> 2N2O5 + 4HPO3
This is a limiting reagent problem.
mols HNO3 = grams/molar mass
mols P4O10 = grams/molar mass
Convert mols HNO3 to mols N2O5 using the coefficients in the balanced equation.
Do the same for mols P4O10 to mols N2O5.
It is likely the two values for mols N2O5 will NOT be the same which means one of them is wrong. The correct value in limiting reagent problems is ALWAYS the smaller one and the reagent producing that number is the limiting reagent.
Using the smaller value, convert mols N2O5 to grams N2O5. g = mols x molar mass.
Post your work if you get stuck.