試題詳解

複選題
21. A certain liquid (X) has a normal boiling point of 353 K. The densities (in g/L) of the vapor X in equilibrium with its liquid at 300 K and 353 K are 0.50 and 2.7, respectively. Assume the vapor behaves ideally, answer the following questions.
(A) Find the molar mass of X.   3%
(B) Find the vapor pressure of liquid X at 300 K.   2%
(C) If the saturated vapor of X at 353 K in a 2.0 L glass flask is cooled to 300 K, what is the mass of X that the will be condensed?   2%
(D) If X is a hydrocarbon containing 92.3% carbon, what are the empirical formula and molecular formula of X?   3%