
Concept explainers
(a)
Interpretation: Whether the pressure of tire increases or decreases need to be explained.
Concept Introduction: The combined gas law is combination of three
(a)

Explanation of Solution
The initial pressure and temperature is 1.0 atm and 21 oC respectively. The final temperature is 55 oC. The volume and number of moles of gas in the tire is constant.
According to Gay-Lussac’s law, at constant volume, pressure and temperature of the gas are directly proportional to each other.
Here, temperature changes from 21 oC to 55 oC thus, it increases and pressure also increases.
(b)
Interpretation: The equation used to calculate the new pressure of the tire needs to be determined.
Concept Introduction: The combined gas law is combination of three gas laws that is Boyle’s law, Charles’ law and Gay-Lussac’s law. According to this law the ratio of temperature to the product of pressure and volume is a constant.
(b)

Explanation of Solution
According to Gay-Lussac’s law, at constant volume, pressure and temperature of the gas are directly proportional to each other This is mathematically represented as follows:
Here, T1 is initial volume, T2 is final volume, P1 is initial pressure and P2 is final pressure.
Thus, the following equation can be used to determine the new pressure:
(c)
Interpretation: The pressure of the tire at 55 oC needs to be determined.
Concept Introduction: According to Gay-Lussac’s law, at constant volume, pressure and temperature of the gas are directly proportional to each other This is mathematically represented as follows:
Here, T1 is initial volume, T2 is final volume, P1 is initial pressure and P2 is final pressure.
(c)

Explanation of Solution
The initial pressure and temperature is 1.0 atm and 21 oC respectively. The final temperature is 55 oC.
The given initial and final temperature can be converted into Kelvin as follows:
And,
The final pressure can be calculated as follows:
Putting the values,
Therefore, the new pressure is 1.12 atm.
Chapter U3 Solutions
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