The number of endothermic process/es from the following is _______.
A. `I_2(g) rarr 2I(g)`
B. `HCl(g)` `rarr` `H(g) +Cl(g)`
`C. H_2O(I) rarr H_2O(g)`
D. `C(s)+O_2 (g) rarr CO_2(g)`
E. Dissolution of ammonium chloride in water

Predict the sign of DeltaS for each of the following process: a. O_(2)(g) rarr 2O(g) b. N_(2)(g) +3H_(2)(g) rarr 2NH_(3)(g) c. C(s) +H_(2)O(l) rarr CO(g) +H_(2)(g) d. Br_(2)(l) rarr Br_(2)(g) e. N_(2)(g, 10 atm) rarr N_(2)(g,1atm) f. Desalination of water. g. Devitrification of glass h. Hard boiling og an egg i. C(s, "graphite") rarr C(s, "diamond")

Calculate the heat of combustion of benzene form the following data: a. 6C(s) +3H_(2)(g) rarr C_(6)H_(6)(l), DeltaH = 49.0 kJ b. H_(2)(g) +1//2O_(2)(g) rarr H_(2)O(l), DeltaH =- 285.8 kJ c. C(s) +O_(2) (g) rarr CO_(2)(g), DeltaH =- 389.3 kJ

Consider the following reactions: I. C(s) + 1/2 O_(2)(g) rarr CO(g)," "Delta H_(1) = x_(1) II. CO(g) + 1/2 O_(2)(g) rarr CO_(2)(g), " "Delta H_(2) = x_(2) III. C(s) + CO_(2)(g) rarr 2CO(g)," "Delta H_(3) = x_(3) Select the correct statements:

For the reaction. H_(2)(g) +2ICI(g) rarr 2HCl(g) +I_(2)(g) one proposed mechanism is H_(2)(g) +ICI(g) rarr HICI(g) +H(g)" " (fast) H(g) +ICl(g)rarr HCl(g) +I(g) " " (fast) HICl(g) rarr HCl(g) +I(g)" " (fast) I(g) +I(g) rarr I_(2)(g)" " (fast) Intermediates in this reaction include which of the following?

In the following process/es Delta H lt Delta U (A) C(s) + O_(2)(g) rarr CO_(2)(g) (B) CO(g)+(1)/(2)O_(2)(g) rarr CO_(2)(g) (C) N_(2)(g)+3H_(2)(g) rarr 2NH_(3)(g) (D) CaCO_(3)(s) rarr CaO(s) + CO_(2)(g)