
Concept explainers
Interpretation:
The percent composition by mass of
Concept Introduction:
Ideal gas Equation:
Any gas is described by using four terms namely pressure, volume, temperature and the amount of gas. Thus combining three laws namely Boyle’s, Charles’s Law and Avogadro’s Hypothesis the following equation could be obtained. It is referred as ideal gas equation.
Under some conditions gases don not behave like ideal gas that is they deviate from their ideal gas properties. At lower temperature and at high pressures the gas tends to deviate and behave like real gases.
Boyle’s Law:
At given constant temperature conditions the mass of given ideal gas in inversely proportional to its volume.
Charles’s Law:
At given constant pressure conditions the volume of ideal gas is directly proportional to the absolute temperature.
Avogadro’s Hypothesis:
Two equal volumes of gases with same temperature and pressure conditions tend to have same number of molecules with it.

Answer to Problem 102IL
The percent composition by mass of
Given:
Explanation of Solution
The balanced chemical equation for the reaction of the two given gases with
First using the ideal gas equation the moles of
Here, we carry an extra significant figure throughout this calculation to limit rounding errors.
From the balanced chemical equation it is clear that one mole of both the gases gives rise to one mole of
Hence, there exists 1:1 mole ratio between
The mass of the remaining
Determine the percent composition by mass of
Similarly, the weight percentage for the other gas in the mixture is as follows,
The percent composition by mass of
The percent composition by mass of two given gases in the mixture was calculated by using the ideal gas equation and the expression used for moles calculation.
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