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Volume of Gases and Number of Moles

A cylinder co...

Question

A cylinder contains 6.8g of ammonia gas at stp
1. What is the volume occupied by this gas?
2. How many moles of ammonia are present in the cylinder?
3. How many molecules of ammonia are present in the cylinder?

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Solution

1 mole gas at STP has 22.4 L volume
6.8 g of ammonia has 6.8/17 = 0.4 moles
volume = .422.4 = 8.96 L
number of molecules = 0.46.02210^23 = 2.4088 10^23

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