# The experimentally measured vapor pressure of SO2 at -25 degrees C is 49.5 kPa and at 0 degrees C is 155 kPa.?

Determine the enthalpy of vaporization, ΔHvap, at 100 degrees C.

### 1 Answer

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- Dr WLv 710 months ago
via the clausius clapeyron equation

.. ln(P1 / P2) = (-dHvap/R) * (1/T1 - 1/T2)

you know..

.. P1 = 49.5 kPa

.. P2 = 155 kPa

.. R = 8.314 J/molK

.. T1 = -25 + 273.15 = ___ K

.. T2 = 0 + 273.15 = 273.15K

so calculate dHvap over that range

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without more information, like

.. what class is this for

.. what have you been studying

.. etc

I'd probably assume that dHvap is constant over the range - 25°C to 100°C

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