# Determine how many grams of phosphorus is required to obtain 25 grams of P2O5. find the volume of oxygen.

September 23, 2021 | education

| The synthesis reaction of pentavalent phosphorus oxide is described by the following chemical reaction equation:

4P + 5O2 = 2P2O5;

4 phosphorus atoms interact with 5 oxygen molecules. During the reaction, 2 molecules of pentavalent phosphorus oxide are synthesized.

Let’s calculate the chemical amount of a substance contained in phosphorus oxide weighing 25 grams.

M P2O5 = 31 x 2 + 16 x 5 = 142 grams / mol;

N P2 O5 = 25/142 = 0.176 mol;

To synthesize such an amount of oxide, it is necessary to take 0.176 x 2 = 0.352 mol of phosphorus.

Let’s calculate its weight:

M P = 31 grams / mol;

m P = 0.352 x 31 = 10.912 grams;

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.