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Ch.10 - Gases
Brown - Chemistry: The Central Science 14th Edition
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Tutti i libri di testoBrown 14th EditionCh.10 - GasesProblema 64
Capitolo 10, Problema 64

A deep-sea diver uses a gas cylinder with a volume of 10.0 L and a content of 51.2 g of O2 and 32.6 g of He. Calculate the partial pressure of each gas and the total pressure if the temperature of the gas is 19 °C.

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Step 1: Convert the temperature from Celsius to Kelvin by adding 273.15 to the Celsius temperature. This is necessary because gas law calculations require temperature in Kelvin.
Step 2: Calculate the number of moles of each gas using the formula \( n = \frac{m}{M} \), where \( n \) is the number of moles, \( m \) is the mass of the gas, and \( M \) is the molar mass of the gas. Use the molar mass of O2 (32.00 g/mol) and He (4.00 g/mol).
Step 3: Use the ideal gas law \( PV = nRT \) to calculate the partial pressure of each gas. Rearrange the formula to \( P = \frac{nRT}{V} \), where \( P \) is the pressure, \( n \) is the number of moles, \( R \) is the ideal gas constant (0.0821 L·atm/mol·K), \( T \) is the temperature in Kelvin, and \( V \) is the volume in liters.
Step 4: Calculate the partial pressure of O2 by substituting the number of moles of O2, the ideal gas constant, the temperature in Kelvin, and the volume of the cylinder into the rearranged ideal gas law equation.
Step 5: Calculate the partial pressure of He using the same method as in Step 4, substituting the number of moles of He. Then, add the partial pressures of O2 and He to find the total pressure in the gas cylinder.

Concetti chiave

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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 is essential for calculating the behavior of gases under various conditions, allowing us to determine the pressure exerted by a gas in a given volume at a specific temperature.
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Ideal Gas Law Formula

Partial Pressure

Partial pressure is the pressure that a single gas in a mixture would exert if it occupied the entire volume alone. According to Dalton's Law of Partial Pressures, the total pressure of a gas mixture is the sum of the partial pressures of each individual gas, which is crucial for solving the problem at hand.
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Partial Pressure Calculation

Molar Mass and Moles Calculation

To calculate the partial pressures, it is necessary to convert the mass of each gas into moles using their respective molar masses. This conversion is vital for applying the Ideal Gas Law, as the number of moles (n) directly influences the pressure calculation for each gas in the mixture.
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Percorso guidato
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Molar Mass Calculation Example
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