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- PERCOMP.CAL
-
- a Supercalc(tm) template
- for chemical percent compositions
- by
- Stephen J. Cebula
-
-
- INTRODUCTION
-
- PERCOMP.CAL is a sample template for determining chemical
- percent compositions in Supercalc 2. It contains the worksheet
- for a sample molecule already, but you can fill in the data
- for the molecule you are looking for. All of the elements are
- not listed merely for convenience, because, a template of over 100
- elements is a bit impractical to solve a percent composition
- problem for a molecule with only 3 or 4 elements.
-
- PERCOMP.CAL was created by Stephen Cebula as an exercise from
- his chemistry 101 class. It serves as a useful example of how the
- computer can be used by a student other than for word processing.
-
-
- FORMULAS
-
- When you insert new elements in this template, pay close
- attention to the formula used to determine the individual percent
- composition for an element. It is the net mass of that element in the
- molecule, divided by the total mass of the molecule, times 100 to
- get a percentage. A sample formula for column E which represents the
- individual percent composition would look like this for the element in
- row 20:
-
- D20/D25*100
-
- where D25 represents the total molar mass of the molecule and D20 is
- the net mass of the element. Here, oxygen (O), has two atoms (from data in
- column C) and an atomic mass of 15.994 (for each oxygen atom). Therefore,
- the net mass equals 2 times 15.994 or B20*C20 in Supercalc notation. A little
- reminder, when you insert or delete atoms in this list, you should also make sure
- that the equations are in the same form as the original ones, Also, you must
- make sure that the cell representing the total molar mass (D25 in this case) is
- the sum of all net masses. It is SUM(D8:D23) in the original version.
-
-
-
- USAGE NOTICES
-
- This template is for the public domain only. It may not sold or
- published in any form without permission of the author, Stephen J. Cebula;
- if you have any ideas to improve this template or for other useful
- applications for students, please feel free to contact the author via
- mail or one of the following Pennsylvania bulletin boards:
-
- Allentown RCP/M 215-398-3937
- CTS RCP/M 215-947-3615 <not 2400 baud>
- System-2 TBBS 215-825-3205
-
- or write:
-
- Stephen J. Cebula
- 2349 Packard Avenue
- Huntingdon Valley, PA 19006
-
-
- OTHER VERSIONS
-
- Enjoy this Supercalc template. It serves as a example of how the computer
- can be of use to non-Computer Science majors in an educational setting other
- than just word processing. The same technique can be used with other spreadsheets
- to solve the percent composition problem.
-
- A version of this template exists for Multiplan(tm) in CP/M(tm) and Apple
- Macintosh(tm) form. If you are interested in such items, just contact me in one of
- the forementioned ways.
-
-