Calculate the percentage composition of argon

0.93%...

Argon Ar 39.948 0.934 % 6.59 x 1019

No, it is impossible.

Chemical reactions does not change or turn elements into different elements.

Changing an element implies to modify its atomic number (the number of protons in the nucleus).

Chemical reactions do not modifiy the nuclei of the elements involved.

Chemical reactions imply the formation or rupture of bonds between elements. Bonds are union of elements at the level of electrons.So, formation or rupture of bonds involve only a different combination of the atoms, never modifications of the atoms at the level of nuclei or parts of nuclei.