Respuesta :

PH3 has a greater vapour pressure at a particular temperature.

NH3 has hydrogen bonding because of its N-H bond. Due to the absence of an N-H, O-H, or F-H bond, PH3 has weaker dipole forces.

What exactly is vapour pressure ?

When solid or liquid condensed phases in a closed system are in thermodynamic equilibrium with one another at a specific temperature, the force that a vapour exerts on those phases is known as vapour pressure (or equilibrium vapour pressure).

  • For instance, since the atmospheric pressure is the same when water boils at sea level, the vapour pressure is 1 atmosphere.

Learn more about Vapor pressure here:

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