It is an example of a Chemical change.
I would choose count of electron shells and count of valence electrons. The electron configuration of each element is fixed and can be used to determine the element's identity. By counting the electron shells, you can have an idea which part of the periodic table the mystery element lies, and by determining the number of valence electrons (outermost shell), you can pinpoint the exact identity of the mystery element.
Pretty sure its Physical Changes
No chemical reaction is happening.
2 elections will fill the first energy level
If 4 moles of P is used by 5 mole of O2
then....0.489 moles will be used by 5/4 × .489 = .611 moles of O2
so .611 moles
so if 4 moles of P is burnt , 1 mole of P4O10 is produced ....so for .489 moles...... .489/4=.122 moles !
so mass will be .122× 283.89 = 34.7 grams
so first ans is .611 moles and second is 34.7 grams !
if you have any problem regarding this , just comment !!!
