Concept explainers
A sample of sodium peroxide, Na2O2, was reacted with an excess of water.
All of the sodium peroxide reacted, and the oxygen was collected over water at 21°C. The barometric pressure was 771 mmHg. The apparatus was similar to that shown in Figure 5.20. However, the level of water inside the tube was 25.0 cm above the level of water outside the tube. If the volume of gas in the tube is 31.0 mL, how many grams of sodium peroxide were in the sample?
Interpretation:
The amount of sodium peroxide (in grams) present in the sample after the reaction should be calculated.
Concept Introduction:
1. The relation between pressure and height of the barometer is given as
2. Ideal gas equation:
At a constant temperature (K) and pressure (P), the volume (v) occupied by the no of moles of any gas is known as ideal gas equation.
Ideal gas equation:
3.
Answer to Problem 5.153QP
The amount of sodium peroxide (in grams) sample present is
Explanation of Solution
Given,
A sample of sodium peroxide with pressure
The level of water inside the tube is
The volume of gas in the tube =
Since level of water inside the tube is above the level of water outside the box
So subtract the level of water inside the tube
Compare P1 and P2 we will get
Pressure of the gas can be calculated as
The amount of sodium peroxide (in grams) present in the sample after the reaction is calculated as
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