Lesson 3 - Gas Laws SAQ
This lesson allows you to test yourself on the material covered in the Gas Laws lesson and determine the level to which you have met the learning outcomes.
Self-Assessment Questions
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*List four key brewery gases. Describe how they are commonly produced, and list uses for them in the brewery.
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*A CO2 recovery balloon holds CO2 at a pressure of 5 kPa g and a temperature of 15 °C. If the balloon volume is 10 m3, what mass of CO2 is held within the balloon? Atmospheric pressure is 100 kPa.
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*Determine the density of nitrogen at standard temperature and pressure.
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*Determine a factor for dissolved carbon dioxide in water to convert from v/v at STP to g/L.
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**Determine the molecular mass of beer if the composition is ethanol 4% (w/w), CO2 at 5 g/kg and the remainder is water.
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**Atmospheric air is supplied to a yeast propagation vessel to provide oxygen for yeast growth. The vessel is kept under a slight back-pressure of 1.1 bar a. What will be the partial pressure of oxygen once the air has filled the vessel? You may assume the oxygen content of atmospheric air to be 21% (v/v).
If pure oxygen was supplied to the propagation vessel at the same pressure, what would be the partial pressure of oxygen?