Coffee 4-h
When 40.0 mL of 0.540 M H2SO4 is added to 40.0 mL of 1.08 M KOH in a coffee-cup calorimeter at 23.50°C, ......?
When 40.0 mL of 0.540 M H2SO4 is added to 40.0 mL of 1.08 M KOH in a coffee-cup calorimeter at 23.50°C, the temperature rises to 30.17°C. Calculate H of this reaction per mole of H2SO4 and KOH reacted. (Assume that the total volume is the sum of the individual volumes and that the density and specific heat capacity of the solution are the same as for pure water: d = 1.00 g/mL and c = 4.184 J/g×K.)
H per mole of H2SO4 reacted:
kJ/mol
H per mole of KOH reacted:
kJ/mol
40.0 mL added to 40.0 mL = 80.0 ml
@ d = 1.00 g/mL that's 80.0 grams
note the 4.184 J/g-C equals 4.184 J/g×K.)
because every degree dT in Kelvin equals a degree dT in Celsius
find dH
dH = m C dT
dH = 80.0 (4.184 j/g-C) (6.67 C rise)
dH = 2232.6 Joules
==========================================
find moles:
0.0400 L of 0.540 mol/Litre H2SO4 = 0.0216 moles H2SO4
0.0400 L of 1.08 mol/Litre KOH = 0.0432 moles KOH
Calculate H of this reaction per mole of H2SO4 reacted:
2232.6 Joules / 0.0216 moles H2SO4 = 103,361 Joules
your answer, rounded to 3 sig figs is
103 kJ/mol H2SO4
Calculate H of this reaction per mole of KOH reacted:
2232.6 Joules/ 0.0432 moles KOH = 51,681 Joules
your answer, rounded to 3 sig figs is
51.7 kJ/mol KOH
4 h du mat. (4'o clock in the morning)
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