# Download A simple calorimeter was used as a vessel to measure the heat

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Transcript
```A simple calorimeter was used as a vessel to measure the heat evolved or absorbed during the following reaction:
KOH (s) + HBr(aq)  H2O(l) + KBr(aq)
a) If a solution of HBr(aq) has a concentration of 3.00M then how many moles of HBr are in 250mL?
b) Given a starting mass of 15.00g KOH and 100.0mL of 3.00M HBr, determine the limiting reactant and
the number of moles of water produced.
c) In the reaction above the initial temperature is 21.0˚C and the final temperature is 65.8˚C. Assume the
density of KBr(aq) is 1.0g/mL.
i. Calculate ΔT for this reaction
ii. Clearly identify this reaction as exothermic or endothermic with the appropriate sign.
iii. Calculate q.
d) Determine the ΔH for this reaction in kJ/mol of H2O.
e) Calculate a percentage yield if the known value is -100.13kJ/mol.
f) Diagram a Reaction Pathway for this system. Clearly identify the energy change within the system.
Explain how this diagram supports your answer of whether it is an exothermic or endothermic reaction.
Explanation:
g) A student combines Ammonium Hydroxide and Barium Nitrate to perform a reaction. The solution
vessel felt cold to the touch. This reaction produces +126kJ of energy.
i. Write a balanced chemical equation for this reaction (double replacement with energy
included).
ii. Draw a Reaction Pathway for this system. Clearly identify the energy change within the
system.
Balanced Chemical Reaction
```
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