Question

Problem 2.1 The feed to an ammonia synthesis reactor contains 25 mole% nitrogen and the balance hydrogen. The flow rate of the stream is 3000 kg/hr. Calculate the rate of flow of nitrogen into the reactor in kg/hr. (MW N2-28 g/mol and MW H2-2 g/mol) Problem 2.2 A 40-wt% aqueous sulfuric acid solution is prepared by mixing pure sulfuric acid (100-wt%; density, ρ = 1.84 g/mL; molar mass, Mw-98 g/mol) with pure water (ρ = 1 g/mL, MW = 18 g/mol) For 1 L of 40-wt% aqueous sulfuric acid solution ine the volume of pure sulfuric acid and the volume of water that are needed to prepare this solution. State your assumptions Problem 2.3 A 5.00 wt aqueous sulfuric acid solution (ρ-1.03 gmL) flow through a 45 m long pipe with a 6.0 cm diameter at a rate of 87 LUmin. a) what is the molarity of sulfuric acid in the solution? b) How long (in seconds) would it take to fill a 55-gallon drum, and how much sulfuric acid (Ibm) would the drum contain? Es timate how long (in seconds) it take the solution flow from the pipe inlet to the outlet c)

Answer 1

Answer to problem number 1

Basis: 3000 Kg/hr of feed rate

Mol fraction of nitrogen (Xmn) = 0.25

Mol fraction of hydrogen (Xmh) = 0.75

molar mass of nitrogen(Mw_n) = 28 g/mol

molar mass of hydrogen( Mw_h) = 2 g/mol

we will convert this to mass fraction using following relationship

Hence mass flow rate of nitrogen = 3000*0.823529 = 2470.588 Kg/hr