Question

All modern fertilizers use PO43- as a source of phosphorus. Use your knowledge of the old methods to determine the moles of phosphorus found in 10.0 grams of (15-15-15)?

Answer 1

To determine the moles of phosphorus in 10.0 grams of (15-15-15) fertilizer, we can calculate the amount of phosphorus using the percentage given. Then, we convert the mass of phosphorus to moles using its molar mass.

Step-by-step explanation:

To determine the moles of phosphorus found in 10.0 grams of (15-15-15) fertilizer, we need to calculate the amount of phosphorus in the fertilizer. In (15-15-15) fertilizer, the three numbers represent the percentage of nitrogen (N), phosphorus (P), and potassium (K) respectively. Since the percentage of phosphorus is 15%, we can calculate the amount of phosphorus in 10.0 grams of (15-15-15) fertilizer as follows:

Amount of phosphorus = (15/100) × 10.0 g = 1.5 g phosphorus

Now, to find the moles of phosphorus, we need to convert the mass of phosphorus to moles. The molar mass of phosphorus (P) is approximately 31.0 g/mol. Using this molar mass, we can calculate the moles of phosphorus as follows:

Moles of phosphorus = 1.5 g / 31.0 g/mol ≈ 0.048 moles phosphorus.

Answer 2

The answer is 0.023 moles of phosphorus

Step-by-step explanation:

The 15-15-15 fertilizer is a fertilizer of great versatility, made with nitrogen, phosphorus and potassium, which makes it one of the fertilizers most used for fertilizer in the sowing plant, thus covering the crop requirements from planting. .

This fertilizer consists of 14.25% phosphorus pentoxide (P2O5). Therefore, we have to remove 14.25% at 10 grams of 15-15-15 fertilizer to calculate the moles of phosphorus. As follows:

Grams of P2O5 = 10 g x 0.1425 = 1.425 g

We calculate the molecular weight of phosphorus. We use the periodic table:

Phosphorus molecular weight = 2 x 30.97 = 61.94 g/mol

Now we calculate the moles of phosphorus in the fertilizer:

Phosphorus moles = 1,425 g/61.94 g/mol = 0.023 moles