I function as the next. * The content rate is calculated from the atomicity. * The calculation which is nominal composition from the content rate * Oxygen can't be input because calculation of nominal composition assumes a burning way. The rest is calculated as oxygen from a total of the respective content rates. That the number of elements which can be chosen about a trial version is even number 20 of atomic number, it's and number 110 of atomic number can be even calculated by a product edition. Operations check a trial version first, please. ------------ How to use it ------------ (1) It's chosen from the atomicity whether it's calculation of nominal composition from calculation of the content rate or the content rate. (2) The numerical value is input to each element, and a calculation button is pressed. ------------- Notice ------------- (1) Operations check * F12-C (android version 2.3.4) (2) It's possible to choose even 2 kinds of all except for C,H,N,O,S about the element which can be chosen. (3) It's removable on a SD card.