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c127finp3f2000

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  1. Consider the reaction
    NH4NO3(s) NH4- (aq) + NO3-(aq), H = +281. kJ
      Calculate q for the reaction if 50.0 grams of NH4NO3 dissolves in water. Give your answer in kJ.

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      ± w.xy E{± ab},
      and then press the Submit button (below).

      . E{}

    1. Would the container feel hot? Yes or No
    2. If the dissolving occurs in a coffee cup calorimeter containing 750.0 grams of water initially at 27oC, what would be the final temperature (in Celsius)? Assume that the specific heat of the solution is 4.184 J/g-oC.

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      ± w.xy E{± ab},
      and then press the Submit button (below).

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    3. Consider the following thermochemical equation:
      3H2(g) + N2(g) 2NH3; Ho = -91.8 kJ
      What is Ho for the reaction
      4NH3 6H2(g) + 2N2(g)

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      ± w.xy E{± ab},
      and then press the Submit button (below).

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  2. A compound (A) has a vapor pressure of 75 mm Hg. at 25oC. There are 0.0500 moles of A in a 5.00 liter flask at 25oC.
    1. Suppose that we assume that A in the flask is completely in the gaseous phase. What is the pressure of A (in mm Hg) in the flask?

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    2. Is the assumption in the above question correct?
    3. What is the presure in the flask?

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    BONUS
    Consider a metal with the follwing abbreviated configuration in the ground state [Ar]4s23d3. 5.1 grams of this metal are placed in a calorimeter with a heat capacity of 7.75 kT/oC. The meetal is made to react with an excess of a compound with the abbreviated ground state configuration [He]2s22p4. The metal ion in the compound formed by the reaction has an electronic configuration isoelectronic to argon. The temperature in the calorimeter is observed to have increased by 10.0o C. What is H for the formation of 1.00 grams of this compound?

    What's your answer? Choose your answer in scientific notation, i.e.,

    ± w.xy E{± ab},
    and then press the Submit button (below).

    . E{}

    Warning, several drawing and writing questions have been omitted from this online version of the examination.

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    Query, are the (above) answers correct?



    The last time this file was changed (edited) was Wednesday, July 19