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Accounting for Mass
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Accounting for Mass

When is Accounting for Mass Covered?

Accounting for Mass is introduced in ENGR112 during Class 22.1*

*Explaination of Class numbering System


Class 22.1: Accounting for Mass
Understand that mass is conserved, yet can accumulate/deplete and can enter/leave system
Apply the UAE to account for mass
  Understand definitions for conserved quantities, steady state, and extensive properties
Understand how many equations are necessary to solve for unknown quatities
Use mass accounting to simultaneously solve for up to three unknown quantities
Be able to write systems of equations in Matrix form
Understand the Excel commands Minverse() and Mnult()
  Be able to solve systems of equations using Excel

Class Agenda

Class 22.1: Accounting for Mass
Lecture material on accounting for mass
Individual exercise
  Lecture material on mass balance approach
Example of mass balance
Lecture material on rate processes
  Pairs exercise
Lecture material on solving systems of equations in Excel
5 min team exercise
  Excel example of matrices
  5 min pair exercise
  HW assignment

Why is Accounting for Mass Important?

Many engineers work with processes or systems where materials are mixed, seperated or distributed, and must be accounted for. Using accounting for mass concepts and the Universal Accounting Equation can aid in understanding and describing these complex processes and situations.

Mass can be accounted for because it can neither be created nor destroyed.

  • Class 22.1 Powerpoint

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