1 a 75 wt solution of h so4 is diluted using pure water to form a 25 w

Question

1. A 75 wt. % solution of H₂SO4 is diluted using pure water to form a 25 wt. %
solution of H₂SO4 (product).
i) Calculate the mass of each inlet component required to make 1 kg of product.
ii) If the pure water is at 37°C and the 75 wt. % H₂SO4 is at 0°C (inlet conditions),
what is the temperature of the exit (product) stream if the process is conducted in an
insulated tank? (Data can be obtained from the sulfuric acid mixing graph (Figure
8.1-1).
[9]
2. Water (1) and H₂SO4 (2) are mixed at 21°C. The change in enthalpy of mixing is
described by the following equation:
AmixH=-74.4 x1 x2 (0.439 +0.561x₁)
Given that the pure component enthalpies are:
H₁ = 1.591 kJ/mol and H₂ = 1.596 kJ/mol
i) Calculate the enthalpy of an equimolar mixture of water and sulfuric acid at this
temperature. Use the equation provided. Compare your answer to that obtained from
the sulfuric acid mixing graph (Figure 8.1-1).
[10]
ii) Calculate the heat evolved/absorbed during the process of mixing.
[2]