Substance X?

An unknown substance which is an oxide has the ratio of the number of atoms in a molecule N (X): N(Y) = 2: 3.
The relative molecular weight of the unknown molecule is 219.88. The total number of oxygen atoms and unknown substances in the molecule is 10.
What is the substance X?

1 Answer
Apr 24, 2018

Diphosphorus Trioxide

Explanation:

Let X be unknown element,
X_2O_3
Since there are 10 atoms, the molecular formula is
X_4O_6
Let y be relative atomic mass of X,
4y +16(6) = 219.88
y = 30.97
X is phosphorus, hence compound is P_2O_3