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;
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