Use Clausius-Clapeyron equation
"ln\\frac{P_1}{P_2} =\\frac{\\Delta H_{vap}}{R} (\\frac{1}{T_2}-\\frac{1}{T_1})" "P_1 = 101325 Pa"
"T_1 (K) = 273 + 64.8 = 337.8 K"
"T_2(K) = 273 + 38.1 =311.1 K"
"ln\\frac{101325}{P_2} = \\frac{37600}{8.314} (\\frac{1}{311.1}-\\frac{1}{337.8})"
"P_2 = 32115 Pa"
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