Weight--Atomic Percentage Conversion Rule

Washington DC: United States. Department of the Interior. Bureau of Mines. 1969. Presumed First Edition, First printing. Circular rule. The diameter of the tool is approximately 7.25 inches. On the one side there a series of circles with features. These features are unlabeled. There were two clear plastic arms,originally. Only one full arm remain and there is a small stub on the second arm. Converting from atomic percent to weight percent: For each element listed in the compound, multiply the atomic percent of the element by its atomic weight [the larger of the two principal numbers listed for each element in the standard periodic table]. For each element, let’s call this value p. Add all the values of p together, and let’s call this value p(Total). Now, for each value of p, divide it by p(Total), to obtain w. Multiplying the resulting values of w by 100 gives us the weight percent values, for each respective element in the starting compound. Converting from weight percent to atomic percent: For each element listed in the compound, divide the weight percent of the element by its atomic weight. For each element, let’s call this value m. Add all the values of m together, and let’s call this value m(Total). Now, for each value of m, divide it by m(Total), to obtain a. Multiplying the resulting values of a by 100 gives us the atomic percent values, for each respective element in the starting compound. Condition: Fair.

Keywords: Atomic Weight, Atomic percentage, Circular Rule, Scientific Tool, Instruction Manual, Interconverting

[Book #83998]

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