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100ml of PH3 when decomposed produced phosporous and hydrogen. The change in volume is 100ml of PH3 when decomposed produced phosporous and hydrogen. The change in volume is
The equation for the decomposition is: 4PH3 (g) = P4 (s)+ 6H2 (g) (Elemental phosphorus exists as tetraatomic molecules).When the temperature and pressure remain the same, 4 ml of PH3 will give 6 ml of H2. (On applying Gay-Lussac's law ).Hence, 100 ml of PH3 will yield 150 ml of H2.Increase in volume = (150-100) ml = 50 ml. (The volume of solid phosphorus is negligible).There is a 50% increase in volume.
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