Question

Problem Page

Nitrogen dioxide is one of the many oxides of nitrogen (often collectively called "

NOx

") that are of interest to atmospheric chemistry. It can react with itself to form another form of

NOx

, dinitrogen tetroxide.

A chemical engineer studying this reaction fills a

75.0L

tank at

10.°C

with

14.mol

of nitrogen dioxide gas. He then raises the temperature considerably, and when the mixture has come to equilibrium determines that it contains

4.1mol

of nitrogen dioxide gas.

The engineer then adds another

7.0mol

of nitrogen dioxide, and allows the mixture to come to equilibrium again. Calculate the moles of dinitrogen tetroxide after equilibrium is reached the second time. Round your answer to

2

significant digits.

mol

×10

Answer 1

14 0

14-x x

4.1+7 9.9

11.1-y 9.9+y

Moles of Dinitrogen Tetraoxide at equilibrium after second time = 9.9+5.917 = 15.817 mol