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
Udhaya S.
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#

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