1. En la fabricación de una bengala de luz azul, se utilizó el cloruro del metal con número de +2, la fórmula química del compuesto es A. CoCl2
B. CuCl2
C. CuCl
D. CoCl

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

Determine the empirical formula for succinic acid that is composed of 40.60% carbon, 5.18% hydrogen, and 54.22% oxygen.

)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.