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 c and 253 torr at 83.6 c. using these data, calculate (a) the standard enthalpy of vaporization;

-79.8 × 10⁴ J/mol

Explanation:

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 °C and 253 Torr at 83.6 °C.

Then,

P₁ = 35 torr

T₁ = 111.95 + 273.15 = 385.10 K

P₂ = 253 torr

T₂ = 83.6 + 273.15 = 356.8 K

We can calculate the standard enthalpy of vaporization (ΔH°vap) using the two-point Clausius-Clapeyron equation.

where,

R is the ideal gas constant