The normal boiling point of a liquid is 282 °C. At what temperature (in °C) would the vapor pressure be 0.250 atm? (∆Hvap = 28.5 kJ/mol)

Can someone me with these questions plz.

Match term definition ellipse a) diagonal cross section of a cylinder circle b) diagonal cross section through the widest part of a sphere sphere c) cross section parallel to the base of a cone great circle d) shape created when a semi-circle is rotated around the y-axis triangle e) perpendicular cross section of a cone

Use the periodic table to find the molar mass of each element. molar mass h = g/mol molar mass s = g/mol molar mass o = g/mol