How many grams of diphosphorus pentoxide result if 100.0 g of phosphorus are combined with sufficient oxygen?

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03-01-2018
Chemistry

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How many grams of diphosphorus pentoxide result if 100.0 g of phosphorus are combined with sufficient oxygen?

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Dejanras Dejanras · Answer 1 · 2018-01-12T11:27:32+01:00

Dejanras Dejanras

12-01-2018

Answer is: 230 g.
Chemical reaction: P₄ + 5O₂ → 2P₂O₅.
m(P₄) = 100 g.
M(P₄) = 4 · 31 g/mol = 124 g/mol.
n(P₄) = m(P₄) ÷ M(P₄) = 100g ÷ 124g/mol = 0,806 mol.
From reaction: n(P₄) : n(P₂O5) = 1 : 2.
n(P₂O₅) = 1,612 mol.
m(P₂O₅) = 1,612 mol · 142g/mol = 230g.
M - molar mass.
n - amount of substance.

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