The correct answer is A. 2.05 gram.
The reaction of phosphorus and oxygen to form phosphorus pentoxide is as follows:
$P_4 + 5O_2 \to P_4O_{10}$
From the balanced equation, we can see that 1 mole of phosphorus reacts with 5 moles of oxygen to form 1 mole of phosphorus pentoxide. The molar mass of phosphorus is 31 grams per mole, the molar mass of oxygen is 32 grams per mole, and the molar mass of phosphorus pentoxide is 284 grams per mole.
If we have 1.33 grams of phosphorus, we have 0.043 moles of phosphorus. If we have 5.07 grams of oxygen, we have 0.16 moles of oxygen. Since we have less oxygen than we need to react with all of the phosphorus, the limiting reactant is oxygen. This means that we will only produce 0.16 moles of phosphorus pentoxide. The mass of 0.16 moles of phosphorus pentoxide is 4.05 grams. However, since we only have 1.33 grams of phosphorus, we will only be able to produce 2.05 grams of phosphorus pentoxide.
Option B is incorrect because it is the mass of phosphorus pentoxide that would be produced if we had enough oxygen to react with all of the phosphorus. Option C is incorrect because it is the mass of phosphorus pentoxide that would be produced if we had enough phosphorus to react with all of the oxygen. Option D is incorrect because it is the mass of phosphorus pentoxide that would be produced if we had an infinite amount of both phosphorus and oxygen.