# Draw and label the given streams and derive expressions for the indicated quantities in terms of labeled

## Question:

Draw and label the given streams and derive expressions for the indicated quantities in terms of labeled variables. The solution of Part (a) is given as an illustration.

(a) A continuous stream contains 40.0 mole% benzene and the balance toluene. Write expressions for the molar and mass flow rates of benzene, ṅ_{B}(mol C_{6}H_{6}/s) and ṁ_{B}(kg C_{6}H_{6}/s), in terms of the total molar flow rate of the stream, ṅ(mol/s).

(b) The feed to a batch process contains equimolar quantities of nitrogen and methane. Write an expression for the kilograms of nitrogen in terms of the total moles n(mol) of this mixture.

(c) A stream containing ethane, propane, and butane has a mass flow rate of 100.0 g/s. Write an expression for the molar flow rate of ethane, ṅ_{E}(lb-mole C_{2}H_{6}/h), in terms of the mass fraction of this species, x_{E}.

(d) A continuous stream of humid air contains water vapor and dry air, the latter containing approximately 21 mole% O_{2} and 79% N_{2}. Write expressions for the molar flow rate of O_{2} and for the mole fractions of H_{2}O and O_{2} in the gas in terms of ṅ_{1}(lb-mole H_{2}O/s) and ṅ_{2}(lb-mole dry air/s).

(e) The product from a batch reactor contains NO, NO_{2}, and N_{2}O_{4}. The mole fraction of NO is 0.400. Write an expression for the gram-moles of N_{2}O_{4 }in terms of n(mol mixture) and y_{NO}_{2} (mol NO_{2}/mol).

## Step by Step Answer:

**Related Book For**

## Elementary Principles of Chemical Processes

**ISBN:** 978-1119498759

4th edition

**Authors:** Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard