Question

Phosphoric acid, one of the acids used in some cola drinks, is produced by the reaction of phosphorus(V) oxide, an acidic oxide, with water. Phosphorus(V) oxide is prepared by the combustion of phosphorus.

a. True
b. False

Answer 1

The empirical formula of phosphorus(V) oxide is P4O10. The molecular formula is the same as the empirical formula, P4O10, given the molar mass of about 280 g/mol.

Step-by-step explanation:

The question asks about the preparation of phosphoric acid, which is used as an additive in cola drinks. Phosphoric acid (H3PO4) can be produced by the reaction of phosphorus(V) oxide (also known as phosphorus pentoxide) with water.

Phosphorus(V) oxide itself is formed through the combustion of phosphorus. The empirical formula for phosphorus(V) oxide is P4O10 because phosphorus has a valency of +5 in this compound, and each phosphorus atom combines with two and a half oxygen atoms (average).

For calculating the molecular formula when given a molar mass of about 280 g/mol, we would first determine the molar mass of the empirical formula. The molar mass of P4O10 is approximately 283.89 g/mol, which is close to the given molar mass, indicating that the empirical formula and the molecular formula are the same.

Therefore, the molecular formula of phosphorus(V) oxide is also P4O10.