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    At one time, a common means of forming small quanities of oxygen gas in the laboratory was to heat KCLO3: 2KCLO2(s) --> 2KCL + 3O2 Delta H=-89.4KJ

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    At one time, a common means of forming small quanities of oxygen gas in the laboratory was to heat KCLO3:
    2KCLO2(s) --> 2KCL + 3O2 Delta H=-89.4KJ

    For this reaction, calculate the delta H for the formation of
    a)0.855mol of o2
    b) 10.75 g of KCL
    c) The decomposition of KClo3 proceeds spontaneously when it is heated. DO you think that the reverse reaction, the formation of KCLO3 from KCL and O2, is likely to be feasible under ordinary condtions? Explain your answer

    58
    Under constant-volume conditons teh head of combustion of benzoic acid (HC7H5O2) is 26.38Kj.g. A 1.640g sample of benzoic acid is burned in a bomb calorimeter. The temperature of the calorimeter increases from 22.25 celcius to 27.20celcius.
    a) What is the total heat capacity of the calorimeter?
    b) A 1.320g sample of a new organic substance is combusted in the same calorimeter. The temperature of the calorimeter increased from 22.14 celcius to 26.82 degrees celcius. What is the heat of combustion per gram of the new substance
    c) Supose that in changing sample, a portion of the water in the calorimeter were lost, In what way, if any, would this change the heat capacity of the calorimeter

    62
    From the enthalpies of the reaction
    2H2 + O2--> 2H20 H= -483.6kj
    3O2+2)3 H=+284.6Kj
    Calculate the heat of the reaction
    3H2 + O3-->3H20

    74
    Calcium Carbide (CaC2) reacts with water to form acetylene (C2H2) and Ca(OH)2. From the following enthalpy of reaction data and data in Appendix C, calculated H formation of CaC2

    CaC2+2H20-->(Ca(OH2)2 +C2H2 delta H=-127.2Kj

    Ca(OH)2=-986.2kj/mol
    C2H2=226.77 kj/mol

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