Un compus al unui metal M care contine 20 protoni in nucleu, contine alaturi de acesta oxigen si un alt nemetal Y ce are configuratia electronica K=2e, L=8e, M=6e. Stiind ca masa acestui compus respecta relatia M=6 * nr neutronilor din nucleul Y, sa se determine prin calcul formula compusului dat.

If you add 5.00 ml of 0.100 m sodium hydroxide to 50.0 ml of acetate buffer that is 0.100 m in both acetic acid and sodium acetate, what is the ph of the resulting solution? acetic acid: ka = 1.8. x 10-5

What best discribes the relationship between wavelength and frequency in a electromagnetic wave

)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.