## SAT Subject Test Chemistry

__PART 2__

__REVIEW OF MAJOR TOPICS__

__CHAPTER 6__

__Stoichiometry (Chemical Calculations) and the Mole Concept__

__VOLUME–VOLUME PROBLEMS__

This type of problem involves only volume units and therefore can make use of **Gay-Lussac”s Law**: “When gases combine, they combine in simple whole-number ratios.” These simple numbers are the coefficients of the equation.

A typical problem concerning just volume relationships is as follows:

**TIP **

Know Gay-Lussac”s Law.

**EXAMPLE 1:**

What volume of NH_{3 }is produced when 22.4 liters of nitrogen are made to combine with a sufficient quantity of hydrogen under the appropriate conditions?

**USING THE PROPORTION METHOD:**

**USING THE FACTOR-LABEL METHOD:**

From the 2nd step on you would proceed as follows:

**USING THE MOLE METHOD:**

To solve this problem you would proceed as follows:

**EXAMPLE 2: **What volume of SO_{2 }will result from the complete burning of

pure sulfur in 8 liters of oxygen until all the oxygen is used?

**USING THE PROPORTION METHOD:**

**USING THE FACTOR-LABEL METHOD:**

**USING THE MOLE METHOD (NOT REALLY PRACTICAL IN THIS CASE):**

**TRY THESE VOLUME-VOLUME PRACTICE PROBLEMS:**

__5.__ How many liters of hydrogen are necessary to react with sufficient chlorine to produce 12 liters of hydrogen chloride gas?

Ans. 6 L H_{2}*

__6.__ How many liters of oxygen will be needed to burn 100 liters of carbon monoxide?

Ans. 50 L O_{2}*