What is the maximum amount in moles of p2o5 that can theoretically be made from 112 g of p4 and excess oxygen?

1.808 moles

Explanation:

The equation is:-  4P + 5 O2 = 2 P2O5

Number of moles = Mass of substance / Mass of one mole

Given, mass of P₄ = 112 g

Mass of one mole of P₄ = 30.97 g/mol

So, number of moles of P₄ = 112/ 30.97 = 3.616 moles

For 2 moles of  P₂O₅, the number of moles required for P₄ will be 4 moles.

∴ Number of moles of P₂O₅ = 1/2*(number of moles of P₄)

                                                =1/2 * (3.616) = 1.808 moles

So, maximum amount of moles required is 1.808 moles

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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~ trueboss72