PLS HELP ASAP

7.02
2C(s) + 2H2(g) → C2H4(g): ΔH = +52.4 kJ/mol

Which statement about this reaction is correct? (3 points)
52.4 kJ of energy are released for every mole of carbon reacted.
52.4 kJ of energy are absorbed for every mole of carbon reacted.
26.2 kJ of energy are released for every mole of carbon reacted.
26.2 kJ of energy are absorbed for every mole of carbon reacted.

Aperfume bottle is dropped in the corner of a room. the odor of the perfume can be detected on the other side of the room. which statement best describes this observation?

Identify the lewis acid in this balanced equation: ag+ + 2nh3 -> ag(nh3)2+a. ag+b. nh3c. ag(nh3)2+

)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.