6.20 g of fluorene is added to 0.400 kg of benzene and it was found that the freezing point
of benzene decreased by 0.478 °C. What is the
experimental molar mass of fluorene? g/mol
(Kf of benzene = 5.12 K. kg/mol, van't Hoff factor
of fluorene = 1)

Aradio signal from a gps satellite take only about 0.067 seconds to reach a gps reciever. if the speed of light is about 300,000km/s, then approximately how far away is the reciever from from the satellite?

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.