Make up the chemical formula of a substance if it is known that it consists of hydrogen atoms

Make up the chemical formula of a substance if it is known that it consists of hydrogen atoms, oxygen, and the mass composition expresses the ratio: m (H): m (O) = 1: 8

Given:
Unknown substance – HxOy
m (H): m (O) = 1: 8

To find:
HxOy -?

Decision:
1) Calculate the amount of hydrogen substance in an unknown substance:
n (H) = m (H) / M (H) = 1/1 = 1 mol;
2) Calculate the amount of oxygen in the unknown substance:
n (O) = m (O) / M (O) = 8/16 = 0.5 mol;
4) Calculate the indices of the elements in the unknown substance:
x: y = n (H): n (O) = 1: 0.5 = 2: 1;
5) The formula of the unknown substance is H2O – water.

Answer: The formula for an unknown substance is H2O – water.