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Some gaseous PCl₅ is placed in an empty container - VCE - SSCE Chemistry - Question 10 - 2008 - Paper 1
Question 10
Some gaseous PCl₅ is placed in an empty container. When equilibrium is reached, the mass of the gas mixture, compared to the initial mass of PCl₅, is A. halved. B. u... show full transcript
Worked Solution & Example Answer:Some gaseous PCl₅ is placed in an empty container - VCE - SSCE Chemistry - Question 10 - 2008 - Paper 1
Step 1
The mass of the gas mixture, compared to the initial mass of PCl₅, is
Answer
At equilibrium, the mass of the gas mixture remains unchanged. This is because the number of moles of PCl₅ remains constant as long as the container is sealed and no other reactions occur. The process does not involve any loss of mass; hence the total mass will be equal to the initial mass of PCl₅. Therefore, the correct answer is B, unchanged.