﻿ ﻿VOLUME-VOLUME PROBLEMS - Stoichiometry (Chemical Calculations) and the Mole Concept - REVIEW OF MAJOR TOPICS - SAT Subject Test Chemistry

## PART 2 ## REVIEW OF MAJOR TOPICS ### 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 NH3 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 SO2 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 H2*

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

Ans. 50 L O2*

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