The reactions representing the standard heat of formation are
(A) `H_((aq))^(+)+OH_((aq))^(-)rarr H_(2)O_((l))`
(B) `C_((grap hite))+2H_(2(g))rarr CH_(4(g))`
(C) `N_(2(g))+3H_(2(g))rarr2NH_(3(g))`
(D) `S_((Rhombic))+O_(2(g))rarr SO_(2(g))`

For the following three reaction 1, 2 and 3, equilibrium constants are given: (1) CO_((g)) + H_(2)O_((g))hArrCO_(2(g)) + H_(2(g)), K_(1) (2) CH_(4(g)) + H_(2)O_((g))hArrCO_((g)) + 3H_(2(g)), K_(2) (3) CH_(4(g)) + 2H_(2)O_((g))hArrCO_(2(g)) + 4H_(2(g)), K_(3) Which of the following relations is correct ?

In how many of the following entropy increases? {:((a) N_(2(g)) + 3H_(2(g)) rarr 2NH_(3(g)),(b)PCl_(5(g)) rarr PCl_(3(g)) + Cl_(2(g))),((c ) H_(2)O_((s)) rarr H_(2)O_((g)),(d)H_(2)O_((l)) rarr H_(2)O_((g))),((e ) 2NaHCO_(3(s)) rarr Na_(2)CO_(3(s)) + H_(2)O_((g)) + CO_(2(g)),(f ) NH_(2)CO_(2)NH_(4(s)) rarr 2NH_(3(g)) + CO_(2(g))),((g) H_(2)O_((l)) rarr H_(2)O_((s)),(h) CO_(2(s)) rarr CO_(2(g))):}

Write balanced net ionic equations for the following reactions in basic solution: (a) H_(2)O_(2)(aq)+ClO_(4)^(Ө)(aq) rarr ClO_(2)^(Ө)(aq)+O_(2)(g) (b) ( c) Cu(OH)_(2)(s) + N_(2)H_(4)(aq) rarr Cu(s)+N_(2)(g) (d) MnO_(4)^(Ө) + IO_(3)^(Ө)(aq)rarr MnO_(2)(s) + IO_(4)^(Ө)(aq)

For each reaction, wheter the sign of Delta S (entropy) is positive or negative ? (a) Ni(s)+4CO(g)rarr Ni(CO)_(4)(g) (b) 4Fe(s)+3O_(2)(g)rarr 2Fe_(2)O(s) (c ) H_(2)(g)+S(s)rarr H_(2)S(g) (d) 2NO(g)+O_(2)(g)rarr 2NO_(2)(g)

Determine which of the following reactions at constant pressure represents surroundings that do work on the system: I. 4NH_(3)(g)+7O_(2)(g)rarr4NO_(2)(g)+6H_(2)O(g) II. CO(g)+2H_(2)(g)rarrCH_(3)OH(l) III. C(s,"graphite")+H_(2)O(g)rarrCO(g)+H_(2)(g) IV. H_(2)OrarrH_(2)O(l)

In which of the following process maximum energy is released A) S_((g))+e^(-) rarr S_((g))^(-) B) O_((g))^(-) +e^(-) rarr O_((g))^(-2) C) S_((g))^(-)+e^(-) rarr S_((g))^(-2)

In the reaction 2H_(2)(g) + O_(2)(g) rarr 2H_(2)O (l), " "Delta H = - xkJ

Identify the oxidant and reductant in the following reactions: a. 10H^(o+)(aq)+4Zn(s)+NO_(3)^(ө)(aq)rarr4Zn^(2+)(aq)+NH_(4)^(o+)(aq)+3H_(2)O(l) b. I_(2)(g)+H_(2)S(g)rarr2Hl(g)+S(s)

Use standard enthalpies of formation to calculate the value of Delta_(r )H^(Θ) for the reaction 2H_(2)S(g) + 3O_(2)(g) rarr 2H_(2)O(l) + 2SO_(2)(g)

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 of an egg i. C(s, "graphite") rarr C(s, "diamond")