In water weighing 120 g, 5 g of phosphorus oxide (5) was dissolved by heating. Calculate the mass, amount of substance

| August 10, 2021 | education

In water weighing 120 g, 5 g of phosphorus oxide (5) was dissolved by heating. Calculate the mass, amount of substance and mass fraction of orthophosphoric acid in the resulting solution.

1. Calculate the mass of the sulfuric acid solution obtained by dissolving phosphorus oxide in water. Let us find the sum of the mass of water and the mass of the oxide.

2. Let’s compose the equation of the reaction between molecules of water and phosphorus oxide. The reaction produces phosphoric acid.

3. Let us indicate the quantitative ratios in which phosphorus oxide and phosphoric acid (1: 2) participate in this reaction.

4. To find the amount of phosphoric acid substance, you first need to find the amount of phosphorus oxide substance using the formula.

5. The amount of phosphorus oxide substance is 0.035 mol, and from the equation it can be seen that the amount of phosphoric acid substance is 2 times greater. Therefore, the amount of acid substance is 0.07 mol.

6. Find the mass of phosphoric acid.

7.Calculate the mass fraction of phosphoric acid according to the formula.



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