What information is needed to calculate the percent composition of a compound?
the weight of the sample to be analyzed and its molar volume
the formula of the compound and the atomic mass of its elements
the weight of the sample to be analyzed and its density
the formula of the compound and its density

Which of these statements explains the difference between nuclear binding energy and the strong nuclear force ?

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al oxidizing agent = reducing agent =

)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.