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Ordinary white phosphorous consists of phosphorus molecules of formula :
- P2
- P10
- P4
- P5
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Phosphorus occurs in several allotropic forms, white phosphorus and red phosphorus being the commonest P4 is a waxy white, very in-flammable and poisonous solid.
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Q2
White phosphorous is a tetra atomic solid [P4(s)] at room temperature and on strong heating in absence of oxygen, it polymerizes into red phosphorus as:
ΔH=−104 kJ/mol of P4
The enthalpy of sublimation [P4(s)→P4(g)] white is 59 kJ/mol and enthalpy of atomization is 316.25 kJ/mol of P(g).
Now find the average P−P bond enthalpy in P4 molecule is:
ΔH=−104 kJ/mol of P4
The enthalpy of sublimation [P4(s)→P4(g)] white is 59 kJ/mol and enthalpy of atomization is 316.25 kJ/mol of P(g).
Now find the average P−P bond enthalpy in P4 molecule is:
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Q3
White phosphorous is a tetra atomic solid [P4(s)] at room temperature and on strong heating in absence of oxygen, it polymerizes into red phosphorus as:
ΔH=−104 kJ/mol of P4
The enthalpy of sublimation [P4(s)→P4(g)] white is 59 kJ/mol and enthalpy of atomization is 316.25 kJ/mol of P(g).
Now find the average P−P bond enthalpy in P4 molecule is:
ΔH=−104 kJ/mol of P4
The enthalpy of sublimation [P4(s)→P4(g)] white is 59 kJ/mol and enthalpy of atomization is 316.25 kJ/mol of P(g).
Now find the average P−P bond enthalpy in P4 molecule is:
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