Question

A car burns 420. g of N2, according to the equation N2 + 2O2 -> 2NO2
3NO2 + H2O -> 2HNO3 + NO
How many grams of HNO3 will be produced?

Answer 1

Calculate the amount of substance for nitrogen, assume that the reactions are irreversible and make sure the stoichiometry is right and calculate the amount of substance for nitric acid then just use the relation between amount of substance and molecular mass to calculate the mass.

Answer 2

So, I got

Answer 3

\[n(N _{2})=\frac{ m(N _{2} }{ M(N _{2}) }\]
\[n(NO _{2})=2*n(N _{2})\]
\[\frac{ n(HNO _{3}) }{ 2 }=\frac{ n(NO _{2}) }{ 3 } \rightarrow n(HNO _{3})=\frac{ 2 }{ 3 } n(NO _{2})\]
\[m(NHO _{3})=n(NHO _{3})M(NHO _{3})\]
What I can see.

Answer 4

Oh, you have to go all the way through the equation? I didn't think of having to use NO2.

Answer 5

well it is a 100% sure way.

Answer 6

So longer you remember the stoichiometry your way might work too... haven't checked.

Answer 7

No, you were right! I had to go all through the equation. Thank you! :)

Answer 8

But if you substitute everything together into 1 single equation is up to you, or you can calculate the things part by part. :)

Answer 9

And no problem.

Answer 10

You are a genius. Want to help me with a couple more? :)

Answer 11

No I'm just me :) and unfortunately I can't... I should be in bed 15 min ago. but tag one called "aaronq" he know all this as well.

Answer 12

Well thank you again! It's greatly appreciated. :)

Answer 13

No problem at all.