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.
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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