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Molality

"PCl5(g) PCl3...

Question

"PCl5(g) PCl3(g) + Cl2(g) Vapour density is found to be 100 when 1 mole of PCl5 is taken in a 10 litre flask at 27* C." How did the initial density equals to M/2? Since volume is 10 L shouldn't ot be M/10?

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P C l_{5} (g) ⇌ P C l_{3} (g) + C l_{2} (g)

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