If a 8.5 g sample of an unknown compound decomposes to produce 7.29 g n 2 o 5 and 1.21 g h 2 o, what is its empirical formula?

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Chemistry

22 December, 03:29

If a 8.5 g sample of an unknown compound decomposes to produce 7.29 g n 2 o 5 and 1.21 g h 2 o, what is its empirical formula?

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Jillian Steele · Answer 1

Answer is: empirical formula is HNO₃.

m (unknown compound) = 8,5 g.

m (N₂O₅) = 7,29 g.

m (H₂O) = 1,21 g.

n (N₂O₅) = m (N₂O₅) : M (N₂O₅).

n (N₂O₅) = 7,29 g : 108,01 g/mol.

n (N₂O₅) = 0,0674 mol.

n (H₂O) = m (H₂O) : M (H₂O).

n (H₂O) = 1,21 g : 18 g/mol.

n (H₂O) = 0,0673 mol.

n (H₂O) : n (N₂O₅) = 0,0673 mol : 0,0674 mol.

n (H₂O) : n (N₂O₅) = 1 : 1.

Compound has two hydroge, two nitrogen and six oxygen, can divided with two.