Care must be taken when diluting sulfuric acid with water, because the dilution
ID: 900347 • Letter: C
Question
Care must be taken when diluting sulfuric acid with water, because the dilution process is highly exothermic: H2SO4(l) "arrow" H2SO4(aq) + heat a) Find the Ho for diluting 1.00 mol of H2SO4(l) (d = 1.83 g/mL) to 1 L of 1.00 M H2SO4(aq) (d = 1.060 g/mL). Suppose you carry out the dilution in a calorimeter. The initial T is 28.8C, and the specific heat capacity of the final solution is 3.50 J/g·K. What is the final T? the first part is -93.52? ...I don't know what the temp is though...It said hint: what formula should be used to find the standard enthalpy of a reaction?..it is NOT 377.32 degrees!!!!
Explanation / Answer
Solution:
1 mol H2SO4(l) --> 1 mol H2SO4(aq)
H2SO4(l) dHf = –814.0 kJ/mole
H2SO4(aq) dHf = –909.3 kJ/mole
dH reaction = (dHf products) - (dHf reactants)
dH reaction = ( –909.3) - (–814.0)
dH reaction = –909.3 + 814.0
dH reaction = –95.3 kJ for disociating that 1 mole of H2SO4