Chapter 3, Problem 92A

Interpretation Introduction

(a)

Interpretation:

Whether combining the elements yields a compound or a mixture needs to be determined.

Concept introduction:

Hydrogen and oxygen reacts at high temperature and pressure to form water molecule that is the reason they don’t react normally at room temperature.

Answer to Problem 92A

A compound is formed by combining the elements hydrogen and oxygen.

Explanation of Solution

Combining the elements hydrogen and oxygen gas yields a compound that is water.

${\text{H}}_{\text{2}}{\text{(g)+O}}_{\text{2}}\text{(g)}\to {\text{H}}_{\text{2}}\text{O}$

(b)

Interpretation Introduction

Interpretation:

The approximate ratio of the mass of X to the mass of Y in the samples that are from the same compound needs to be determined.

Concept introduction:

When fuels are burned in vehicle at high temperatures the nitrogen and oxygen from the air combine to produce nitrogen monoxide (NO). This poisonous gas when released from vehicle exhaust systems it combines with oxygen in the air to form nitrogen dioxide ${\text{(NO}}_{\text{2}}\text{)}$.

Answer to Problem 92A

Mixture of Nitrous acid and nitrogen dioxide are formed from the combination of nitrogen and oxygen.

Explanation of Solution

Combining nitrogen and oxygen yields nitrous oxide. NO further reacts with oxygen to give nitrogen dioxide a highly poisonous gas.

So the combination of nitrogen yields a mixture.

${\text{N}}_{\text{2}}{\text{(g)+O}}_{\text{2}}\text{(g)}\to \text{NO}$

${\text{NO(g)+O}}_{\text{2}}\text{(g)}\to {\text{NO}}_2$