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-50 °C, 0 °C, 50 °C, 100 C! 3 18.2 A sample of a hypothetical ideal gas has a volume of 0.5 m at a temperature of 5 °C and a pressure of 250 kPa. 18 (a) How many molecules of gas are there in this sample? (b) How many moles of gas are there in this sample? th 18.3 A novice pearl diver takes a deep breath before diving. She which is litres, Before

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V- 0-5 m T 55+213 78K Pv nRT ol eJ R T 8 314 J K 8 314 x278 nc 54 08 moles Au --1 me le of a gcu Con raus 6.22X10 molecules 2

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