A new chemistry shareware software product for Apple Macintosh computers titled MoleCalc. The program is a must for practicing chemists and students alike. Chemistry teachers will appreciate the ability to demonstrate the importance of significant figures and uncertainty in atomic weights.

Features:

• Enter and display formulas using standard chemical notation with the ease of the Apple Macintosh graphical user interface
• Select constituent elements of compounds quickly using the standard "Periodic Table" layout via mouse clicks without the need for keyboard input
• Calculate atomic weight of compounds containing any of the known 109 elements
• Calculate atomic weight of compounds containing commonly used stable isotopes
• Calculated atomic weight can be displayed to the correct significant digits depending upon the selected constituent elements
• Calculates uncertainty in the calculated atomic weight based upon the entered elements constituent in the compound
• Calculates weights and uncertainties based on the 1989 Report of the Commission on Atomic Weights and Isotopic Abundances of the IUPAC
• Displays Hill formula for entered compound
• Displays weight percent or weight fraction of each constituent element of the entered compound
• Supports cut & paste for transfer of calculated results to other applications such as spreadsheets or wordprocessors

Both programns are from: