McDalton Learning Edition 1.0

McDalton Learning Edition 1.0

This is a freeware computer program, designed for learning purposes, to calculate molar or formula masses. For this reason the calculations are shown together with the result.

Most textbooks include an atomic mass table with values rounded to one or two decimals. For compatibility with answers on examples given in those textbooks McDalton Learning Edition includes the option to use a fixed number of decimals. This may also increase the readability of the output.

On recommendation by The International Union of Pure and Applied Chemistry, IUPAC, atomic weights of the elements are taken from the review Atomic weights of the elements 2007, published in Pure Appl. Chem. 78(11), 2051-2066, 2006 and Aug 2007 release.

As default all figures are used in the calculations. If you enter the formula of just one element the recommended atomic weight is displayed.


McDalton Professional Edition 1.0 (Latest release published in January 2008)This is a freeware computer program, designed for professional use.

In this program the uncertainty in the calculated molar mass is given as the absolute maximum error of the result. The calculated uncertainty is always rounded up to one significant figure. It is rounded up because otherwise it may occur as underestimated. Then the molar mass is rounded to the same absolute accuracy as given in the rounded uncertainty.

An example will make this clear. The molar mass for PbO is calculated as 207.2 + 15.9994  =  223.1994 and the uncertainty in the molar mass is calculated as 0.1 + 0.0003 = 0.1003. The only significant figure in the uncertainty is the first decimal and therefore molar mass is given as 223.2 ± 0.2 which is the best value and of course the uncertainty is rounded up as explained before.

On recommendation by The International Union of Pure and Applied Chemistry, IUPAC, atomic weights of the elements are taken from the review Atomic weights of the elements 2007, published in Pure Appl. Chem. 78(11), 2051-2066, 2006 and Aug 2007 release.

As default all figures are used in the calculations. If you enter the formula of just one element the recommended atomic weight is displayed.

In this Professional Edition the calculations are shown if the mouse is paused over the values.



Download

To run these programs on older versions of Windows you need to have the Visual Basic 6.0 SP5: Run-Time Redistribution Pack  installed on your computer. The installation process is simple. Follow step 1 below. Then follow step 2 for McDalton Learning Edition or step 3 for McDalton Professional Edition to be installed.

  1. Download the Visual Basic 6.0 SP5: Run-Time Redistribution Pack (VBRun60sp5.exe) from Microsoft Download Center. Just run it once.
  2. Download setupmdl.exe and run it once. The McDalton Learning Edition 1.0 runs on Windows 9x, Me, 2000 and NT.
  3. Download setupmdp.exe and run it once. The McDalton Professional Edition 1.0 runs on Windows 9x, Me, 2000 and NT.

Sumber : http://www.chem4free.info/mcdalton/

~ by evisyari on October 5, 2008.

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