5. Why are the noble gases such as helium (He) and neon (Ne) grouped together in the periodic table?
A They are nonreactive gases.
B. They are highly reactive metallic solids.
C. They are dangerous gases when combined with water.
D. They are liquid at room temperature and have high boiling points.
Pues

Consider the reaction: n2(g) + o2(g) ⇄ 2no(g) kc = 0.10 at 2000oc starting with initial concentrations of 0.040 mol/l of n2 and 0.040 mol/l of o2, calculate the equilibrium concentration of no in mol/l how would this be done?

)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.

In in , is to a 28.4-g (1-oz)−23.0 °c to −1.0 °c?