How many moles of p2o5 can be produced from 63.1 moles of o2? show work, or explain the process of how i can set this up to solve.

What is the percentage by mass of silicon (si) in iron aluminum silicate (fe3al2(sio4)3)?

Describe the chemical reaction based on the chemical equation below. also, explain whether the equation is balanced.

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false