A2.000-g sample of a hydrated copper sulfate is heated, and the waters of hydration are removed. if the mass of the remaining salt is 1.278 g, what was the percentage of water in the original hydrate? use the formula %water=(mass of water/mass of hydrate)•100 -13.0% -36.1% -56.5% -72.2%

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?

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.

How much heat is added if 0.814g of water increase in temperature by 0.351 degree c?