Please see the attached file for the fully formatted problem(s).
An insulated tank, open to the atmosphere, contains 1,500 (lbm) of 40-wt-% sulfuric acid at 60oF. It is heated to 180oF by injection of live saturated steam at 1 atm, which fully condenses in the process. How much steam is required, and what is the final concentration of H2SO4 in the tank?
[TABLE]© BrainMass Inc. brainmass.com July 21, 2018, 2:11 am ad1c9bdddf
From steam tables the enthalpy of saturated steam at 1 atm is 1150.5 Btu/lb.
For acid at 40% and 60 F H_acid=-98 Btu/lb.
Use the first law for open systems:
sum(m_in H_in)=sum(m_out H_out)
m_steam *H_steam(sat, 1 atm) + m_acid* H_acid(40%, 60 F) = (m_steam+m_acid)*H_acid(x%, 180 F).
take the ratio ...
The amount of steam and the final concentration of H2SO4 are calculated.