Page number 65. Questons #2-6 please
2. Calculate the ÄH f of the OH ion given that the ÄH f (H2O) = -285.8 kJ mol . 0 - 0 -1
3. In this experiment it was assumed that the calorimeter neither absorbed nor released heat
(i.e., qcalorimeter = 0), but this is almost certainly not the case. Would the measured value of
ÄH rxn for reaction (1.1) be more or less exothermic if the calorimeter absorbed heat (that is, 0
if qcalorimeter > 0)? Explain why.
4. Without doing any calculations, predict whether the observed ÄT would increase, decrease
or remain the same if the following procedural changes were made. Justify your predictions:
a. 50.0 mL of 0.5 mol L-1 NaOH mixed with 50.0 mL of 0.5 mol L-1 HCl.
b. 50.0 mL of 1.0 mol L-1 NaOH + 25.0 mL of water mixed with 25.0 mL of 1.0 mol L-1
5. Use tabulated standard molar enthalpy changes of formation (from the textbook) to calculate
ÄH rxn for the following (unbalanced) reactions: 0
a. Al(s) + Fe2O3(s) ÿ Fe(s) + Al2O3(s)
b. PbO(s) + C(s) ÿ CO(g) + Pb(s)
c. CaCO3(s) ÿ CO2(g) + CaO(s)
6. Nitroglycerine is a powerful explosive used for blasting rock in road-making. Ignition
produces water, nitrogen, carbon dioxide and oxygen.
When 200 g of nitroglycerine are detonated 5042 kJ of heat are liberated. Calculate ÄHf for 0
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