P. Ma=%. d. R. T

Şükrü Aktaş can you explain please

P=basınç, Ma=molekül kütlesi, %=doğada bulunma oranı, d=özkütle, R=sabit, T=sıcaklık

The atomic percentage is the number of atoms of that element, at that weight percentage, divided by the total number of atoms in the sample multiplied by 100.

So the atomic weight percent is calculated from the element weight percentage by dividing each element weight percentage by its atomic weight, do this for all elements in the sample, you will have a list of atomic proportions. Sum these together to obtain a total atomic weight. Then for each element in the sample divide its atomic proportion by the total and * 100.

Here is an example - using pyrite. EDX will give you

Fe: el wt% 46.55

S: el wt% 53.45

divide each by their atomic weights Fe (55.85) S (32.06) and sum

Fe: 46.55 / 55.85 = 0.833

S: 53.45 / 32.06 = 1.667

divide each by the sum (2.5) and turn into atomic percentage

Fe: 0.833 / 2.5 * 100 = 33 at wt%

S: 1.667 / 2.5 * 100 = 66 at wt%

Hi Singh,

Thank you so much. The remaining one percentage of at.%