Q9 a)The following thermochemical equation is for the reaction of hydrogen bromide(g) to form hydrogen(g) and bromine(l). 2HBr(g)H2(g) + Br2(l)     H = 72.6  kJ/mol-rxn How many grams of HBr(g) would be made to react if 13.9 kJ of energy were provided? grams b)The following thermochemical equation is for the reaction of iron(s) with hydrochloric acid(aq) to form iron(II) chloride(s) andhydrogen(g). Fe(s) + 2HCl(aq)FeCl2(s) + H2(g)     H = -7.40  kJ/mol-rxn When 13.2 grams of iron(s) react with excess hydrochloric acid(aq), kJ of energy are absorbed or evolved? c)The following thermochemical equation is for the reaction of tetraphosphorus decaoxide(s) with water(l) to form phosphoric acid(aq). P4O10(s) + 6H2O(l)4H3PO4(aq)     H =  -453  kJ/mol-rxn How many grams of P4O10(s) would have to react to produce 125 kJ of energy? grams

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Chapter6: Thermochemisty
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Problem 6.136QP: Sulfur dioxide gas reacts with oxygen, O2(g), to produce SO3(g). This reaction releases 99.0 kJ of...
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Q9

a)The following thermochemical equation is for the reaction of hydrogen bromide(g) to form hydrogen(g) and bromine(l).

2HBr(g)H2(g) Br2(l)

            H =

72.6 

      kJ/mol-rxn

How many grams of HBr(g) would be made to react if 13.9 kJ of energy were provided?


grams

b)The following thermochemical equation is for the reaction of iron(s) with hydrochloric acid(aq) to form iron(II) chloride(s) andhydrogen(g).

Fe(s) 2HCl(aq)FeCl2(s) H2(g)

            H =

-7.40 

      kJ/mol-rxn

When 13.2 grams of iron(s) react with excess hydrochloric acid(aq), kJ of energy are absorbed or evolved?

c)The following thermochemical equation is for the reaction of tetraphosphorus decaoxide(s) with water(l) to form phosphoric acid(aq).
P4O10(s) 6H2O(l)4H3PO4(aq)

            H = 

-453 

      kJ/mol-rxn

How many grams of P4O10(s) would have to react to produce 125 kJ of energy?


grams

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