A random radioisotope has a decay constant of 0.00238 years-1. If 1165 years have past, and there was originally 80 grams of it,
roughly how many grams of the original radioisotope remain?

What is the mass of 2.00 l of an intravenous glucose solution with a density of 1.15 g/ml?

Draw two cyclic constitutional isomers of cis-1

)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.