Availability and Screen Shots
You can download the program without the VBRUN300.Dll
and without an install programhere
(Version 3.2, January 1, 1997; 143 kb).
Once you have downloaded the mwt3_2.zip file, create a directory for
the program (eg. C:\MWTWIN), move the file to the directory, unzip the
file, delete the mwt3_2.zip file, and move the Grid.Vbx
file to your \Windows\System directory. Remember, you must have VBRUN300.dll
on your computer to use this file.
Click here
to see a 7 Kb gif of the Windows version of the program. Note the notation
used to enter a molecular formula and note how the program can display
up to seven formulas simultaneously. This picture also shows one of the
three possible ways that standard deviations of results can be shown. At
the bottom of the picture you can see one of the many possible 'caution'
messages displayable by the program. (These messages can be toggled on
and off)
Click here
to see a 5 Kb gif of how the Windows version of the program displays percent
compositions. This picture shows a second way that standard deviations
may be shown.
Click here
to see a 5 Kb gif of the results of the percent solver feature. The user
had entered a target of 1% for oxygen and 64% for chlorine, and the program
calculated the best x to get the actual percent compositions as close to
the target values as possible.
Features of Molecular Weight Calculator for Windows, version 3.2
(January 1997)
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Multi-Line Display
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Display of up to seven formulas with their molecular weights simultaneously.
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Percent Composition
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Percent composition of up to seven formulas.
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Parentheses Are Allowed
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For example, (CH3)3CH2CH3. The program handles up to four layers of embedded
parentheses.
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Hydrates or other addended compounds are allowed
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For example, FeCl3-6H2O is iron(III) chloride hexahydrate.
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User-definable abbreviations for common parts of compounds. Default abbreviations
are included as examples.
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For example PhCl is C6H5Cl and HOac is CH3COOH
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Edit and save abbreviations
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You can edit and save the abbreviations and the elemental values during
program operation.
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Smart Case Conversion
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The program will automatically convert lowercase letters to uppercase where
appropriate for ease of entering a formula. Exact case matching and non-conversion
are available too.
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Isotopes are recognized
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For example, ^13C means Carbon-13 and C6H5^18OH is heavy-oxygen (Oxygen-18)
labeled phenol
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Feature of weighting parts of a compound relative to the other parts.
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For example: [.2Na]Cl would have a weight of 0.2*22.989768+35.4527=40.0507
or NaCl-[.5H2O] would have a weight of 22.989768+35.4527+0.5*(2*1.00794+15.9994)=67.4501
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Percent Solver mode
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Useful for finding the value of "x" in a compound that satisfies user-specified
percent composition requirements.
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Accuracy of the final digit of the molecular weight and percent composition
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Capability to set optional features at the command line when starting the
program and to save and automatically load them during program operation.
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Mole/Mass converter for easily translating moles to mass (kg, g, mg, pounds,
ounces) and back.
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Formula Finder for finding possible compound empirical formulas for a given
molecular weight for a given set of percent composition data.
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Capability of printing results.
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Extensive online help and error checking.
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Finally, it's Freeware and can be copied freely in its fully functional
form.
As an overview of the program and to allow for easier printing, a text-only
version of the program's hypertext help is available here.
Other sites referencing this page or the MWT Win program are (This list is out of date):
