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Ch.5 - Gases
Tro - Chemistry: A Molecular Approach 4th Edition
Tro4th EditionChemistry: A Molecular ApproachISBN: 9780134112831Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoTro 4th EditionCh.5 - GasesProblema 34
Capitolo 5, Problema 34

A syringe containing 1.55 mL of oxygen gas is cooled from 95.3 °C to 0.0 °C. What is the final volume of oxygen gas?

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Identify the initial and final temperatures: \( T_1 = 95.3 \, ^\circ\text{C} \) and \( T_2 = 0.0 \, ^\circ\text{C} \). Convert these temperatures to Kelvin by adding 273.15 to each.
Use Charles's Law, which states that \( \frac{V_1}{T_1} = \frac{V_2}{T_2} \), where \( V_1 \) and \( V_2 \) are the initial and final volumes, and \( T_1 \) and \( T_2 \) are the initial and final temperatures in Kelvin.
Substitute the known values into Charles's Law: \( V_1 = 1.55 \, \text{mL} \), \( T_1 = 95.3 + 273.15 \, \text{K} \), and \( T_2 = 0.0 + 273.15 \, \text{K} \).
Rearrange the equation to solve for \( V_2 \): \( V_2 = V_1 \times \frac{T_2}{T_1} \).
Calculate \( V_2 \) using the rearranged equation to find the final volume of the oxygen gas.

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Ideal Gas Law

The Ideal Gas Law relates the pressure, volume, temperature, and number of moles of a gas through the equation PV = nRT. This law assumes that gases behave ideally, meaning they occupy no volume and have no intermolecular forces. Understanding this relationship is crucial for solving problems involving gas behavior under changing conditions.
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Ideal Gas Law Formula

Charles's Law

Charles's Law states that the volume of a gas is directly proportional to its temperature (in Kelvin) when pressure is held constant. This means that as the temperature of a gas decreases, its volume also decreases. This principle is essential for calculating the final volume of gas when the temperature changes, as in the given question.
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Charles's Law

Temperature Conversion

In gas law calculations, temperatures must be expressed in Kelvin rather than Celsius. The conversion from Celsius to Kelvin is done by adding 273.15 to the Celsius temperature. This conversion is necessary to ensure accurate calculations when applying gas laws, as they require absolute temperature values.
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Temperature Conversion Example
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