Question

The molecular formula P₂O₅ means that
(a) a molecule contains 2 atoms of P and 5 atoms of O
(b) the ratio of the mass of P to the mass of O in the molecule is 2:5
(c) there are twice as many P atoms in the molecule are there are O
atoms
(d) the ratio of the mass of P to the mass of O in the molecule is 5 : 2

Answer 1

Answer:

a is the answer of question of

Answer 2

(a) a molecule contains 2 atoms of P and 5 atoms of O

Explanation:

Molecular formula P₂O₅ means that one molecule of Phosphorus pentoxide contains 2 Phosphorus atoms and 5 oxygen atoms.

Atomic mass of oxygen is 16 and phosphorus is 31. So the ratio of molar mass of P and O in a molecule of phosphorus pentoxide will be (2*31) : (5*16) = 62 : 80 = 31 : 40. So all other options except A is incorrect.

Option A is the answer.