Prince George’s Community College
CHM1010 (SHAH) Practice problems - Thermochemistry
1. 10.0g of water requires 41.8J heat to have its temperature raised by 1.00°C. What is the
specific heat of water?(4.18J.g-1.°C-1 or 1 cal.g-1.°C-1)
2. If a gold ring with a mass of 5.50g changes in temperature from 25.00 to 28.00°C, how
much heat has it absorbed? ( s for gold is 0.129 J.g-1.°C-1)
Heat of combustion: (using constant volume calorimeter) (honor student only)
3. When 1.000g of olive oil was completely burned in pure oxygen in a bomb calorimeter,
the temperature of the water bath increased from 22.000°C to 26.049°C. How many
dietary Calories are in Olive oil, per gram? The heat capacity of calorimeter is
9.032KJ/°C. What is the change in internal energy, ΔE for the combustion of one mole of
glyceryl trioleate?
C57H104O6 + 80O2 57CO2 + 52H2O
Heat of reactions in solution: (using constant pressure calorimeter)
4. The reaction of HCl and NaOH is very rapid and exothermic, the equation is: NaOH(aq)
+ HCl(aq) NaCl(aq) + H2O(l) (honor student only)
5. A student placed 50.0mL of 1.00M HCl at 25.5°C in a coffee cup calorimeter. To this was
added 50.0mL of 1.0M NaOH solution at 25.5°C.The mixture was stirred and the
temperature quickly increased to a maximum of 32.2°C. What is the ΔH express in
kJ/mol of HCl? We assume that their specific heats are close to that of water 4.18J.g1.°C-1.
The density of 1.00M HCl is 1.02 g/mL and the density of 1.00M NaOH is
1.04g/mL.
6. Calculate the enthalpy (ΔH°) of reaction for the following reaction.
CH3COOH(l) + O2(g)  2H2O + CO2(g)
substance
ΔH°f(kJ/mol)
substance
ΔH°f(kJ/mol)
CH3COOH(l)
-484.5
H2O(l)
-285.83