# Determine the formula of an ionic compound, the mass fractions of elements in which are

September 15, 2021 | education

| **Determine the formula of an ionic compound, the mass fractions of elements in which are: calcium 24.39%, nitrogen 17.07%, oxygen 58.54%.**

Let’s write the unknown compound as the expression Ca (x): N (y): O (z).

Knowing the molar mass of each element:

Мr (Ca) = 40 g / mol.

Mr (N) = 14g / mol.

Мr (O) = 16g / mol.

Let’s make the equation:

40x: 14y: 16z = 24.39: 17.07: 58.54.

We decide:

x: y: z = 0.61: 1.22: 3.66.

Reduce to the smallest:

x: y: z = 1: 2: 6

CaN2O6 – this ratio corresponds to the formula of calcium nitrate Ca (NO₃) ₂.

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