1. A chemical reaction has just occurred in an insulated isolated system which c

Question

1. A chemical reaction has just occurred in an insulated isolated system which caused an overall increase in the potential energy of the system. Which statement below is true?
a. Heat was taken in from the surroundings by the system.
b. Heat was given off to the surroundings by the system.
c. The temperature of the system increased.
d. The temperature of the system decreased.


2. One thermochemical equation for the reaction of carbon monoxide with oxygen is:
2CO(g) + O2(g) ? 2CO2(g) ?Ho = -566 kJmol-1
Determine ?Ho in kJ for the complete combustion of 25 kg of carbon monoxide.


3. A coffee cup calorimeter contains 525.0 g of water at 25.0 oC. To it are added: 350.0 g of water at 48.3 oC 480.0 g of water at 63.8 oC Assuming the heat absorbed by the styrofoam is negligible, calculate the expected final temperature. The specific heat of water is 4.184 J g

Explanation / Answer

4)

?Q = m(solutions) x C(solutions) x (?f - ?i) + [ m(calorimeter) x C(calorimeter) ] x (?f - ?i)
?Q = ? x V x C(solutions) x (?f - ?i) + C(calorimeter) x (?f - ?i)
?Q = 1000 x 1.00 x 4.184 x (26.70 - 25.60) + 850.0 x (26.70 - 25.60)
?Q = 5537.4 J

n(NaOH) = C(NaOH) x V(NaOH)
n(NaOH) = 0.200 x 0.500
n(NaOH) = 0.1 mole of NaOH

Heat of reaction, in kJ, per mole of NaOH(aq) :

Heat of reaction = 5537.4 / 0.1 = 54535 J

Heat of reaction = 55374 kJ

5) M(s) + CO2(g) ? CO(g) + MO(s)

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