Establish the simplest formula for the compound of hydrogen with oxygen, containing 5.88% hydrogen by mass.

Establish the simplest formula for the compound of hydrogen with oxygen, containing 5.88% hydrogen by mass. Try to determine the molecular formula of this substance based on the valences of hydrogen and oxygen

Given:
HxOy
ω (H in HxOy) = 5.88%

To find:
HxOy -?

Decision:
1) Let m (HxOy) = 100 g;
2) m (H in HxOy) = ω (H in HxOy) * m (HxOy) / 100% = 5.88% * 100/100% = 5.88 g;
3) m (O in HxOy) = m (HxOy) – m (H in HxOy) = 100 – 5.88 = 94.12 g;
4) n (H in HxOy) = m (H in HxOy) / M (H in HxOy) = 5.88 / 1 = 5.88 mol;
5) n (O in HxOy) = m (O in HxOy) / M (O in HxOy) = 94.12 / 16 = 5.8825 mol;
6) x: y = n (H in HxOy): n (O in HxOy) = 5.88: 5.8825 = 1: 1;
Unknown substance – H2O2 – hydrogen peroxide.

Answer: Unknown substance – H2O2 – hydrogen peroxide.