Which equations are balanced? a. mg (s) + 2hcl (aq) → mgcl2 (aq) + h2 (g) b.3al (s) + 3 br2 (l) → al2br3 (s) c.2hgo (s) → 2 hg (l) + o2 (g) which equations are balanced? a. mg (s) + 2hcl (aq) → mgcl2 (aq) + h2 (g) b.3al (s) + 3 br2 (l) → al2br3 (s) c.2hgo (s) → 2 hg (l) + o2 (g) equations "a" and "c" are balanced. only equation "c" is balanced. equations "b" and "c" are balanced. all of them are balanced?

Which of the following are sources of revenue for media companies? a. direct sales to producers b.advertising and subscriptions c. online purchase d. capital investments

)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.

How does kepler second law of planetary motion overthrow one of the basic beliefs of classical astronomy