Arsine, AsH3, is a highly toxic compound used in the electronics industry for the production of semiconductors. Its vapor pressure is 35 torr at -111.95 degree C and 253 torr at -83.6 degree C. Calculate the delta H of vaporization for arsine and its normal boiling point.

Answer : The value of of vaporization for arsine and its normal boiling point is, 17694.3  J/mol and 209.9 K respectively.

Explanation :

First we have to calculate the value of of vaporization for arsine.

The Clausius- Clapeyron equation is :

where,

= vapor pressure of arsine at = 35 torr

= vapor pressure of arsine at = 253 torr

= temperature of arsine =

= temperature of arsine =

= heat of vaporization = ?

R = universal constant = 8.314 J/mol.K

Now put all the given values in the above formula, we get:

Now we have to calculate the normal boiling point of arsine.

The Clausius- Clapeyron equation is :

where,

= vapor pressure of arsine at = 35 torr

= vapor pressure of arsine at normal boiling point = 760 torr

= temperature of arsine =

= normal boiling point of arsine = ?

= heat of vaporization = 17694.3  J/mol

R = universal constant = 8.314 J/mol.K

Now put all the given values in the above formula, we get:

Hence, the value of of vaporization for arsine and its normal boiling point is, 17694.3  J/mol and 209.9 K respectively.

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