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Ch.10 - Gases: Their Properties & Behavior
McMurry - Chemistry 8th Edition
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Tutti i libri di testoMcMurry 8th EditionCh.10 - Gases: Their Properties & BehaviorProblema 58
Capitolo 10, Problema 58

A small cylinder of helium gas used for filling balloons has a volume of 2.30 L and a pressure of 13,800 kPa at 25 °C. How many balloons can you fill if each one has a volume of 1.5 L and a pressure of 1.25 atm at 25 °C?

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Convert the initial pressure of the helium gas from kPa to atm, knowing that 1 atm = 101.325 kPa.
Use the ideal gas law, PV = nRT, to calculate the number of moles (n) of helium in the cylinder. Assume R = 0.0821 L atm / (mol K) and convert the temperature from Celsius to Kelvin by adding 273.15.
Calculate the total number of moles of helium required to fill one balloon using the ideal gas law, with the volume and pressure given for the balloon and the same temperature and R value.
Divide the total number of moles of helium in the cylinder by the number of moles required to fill one balloon to find out how many balloons can be filled.
Ensure that all units match when performing calculations, especially the units of pressure (atm), volume (L), and temperature (K).

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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 understanding how gases behave under different conditions and allows for the calculation of one variable when the others are known.
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01:15
Ideal Gas Law Formula

Unit Conversion

Unit conversion is crucial in chemistry to ensure that all measurements are in compatible units. In this question, pressures are given in kPa and atm, and volumes in liters, necessitating conversions to apply the Ideal Gas Law correctly and compare the gas conditions.
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01:56
Conversion Factors

Gas Stoichiometry

Gas stoichiometry involves using the relationships between the amounts of reactants and products in a chemical reaction, particularly for gases. In this scenario, it helps determine how many balloons can be filled by calculating the total volume of helium available and comparing it to the volume required for each balloon.
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00:47
Gas Stoichiometry Concepts
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