Solutions (^227)
tion of state for an ideal gas, the pressure of hy-
drogen is
m.,
'.2
2 x10-3 lig x .1/(mol .K) r
PII2^ H 11T .—
p, iv — 2x10°^3 kg/mol x 2 x 10-3 In 3
-- 4.15 X 10 3 T,
where pH. is measured in pascals. The pH, (T)
dependence is linear. Therefore, having calculated
pH, (T) for two values of temperature, say, for
Ti = 373 K, pH. --=-15.5x 10 5 Pa,
T (^2) = 453 K, pH. =--- 18.8 x 10 5 Pa,
we plot the graph of pH, (T).
Using the hint in the conditions of the problem,
we plot the graph of the function plat (T). "Com-
p,70^5 Pa
Fig. 201
posing" the graphs of pH, (T) and Psat (T), we
obtain the graph of the temperature dependence
of the total pressure in the vessel, p (T) (Fig. 201).
Using the p (T) curve, from the initial and final
values of pressure specified in the conditions of the
15*
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