Derive the chemical formula of the oxide, if it is known that 2.3 parts by weight. sodium

Derive the chemical formula of the oxide, if it is known that 2.3 parts by weight. sodium are combined with 0.8 wt.h. oxygen.

Given:
Na – 2.3 wt. h.
O – 0.8 wt. h.

Find:
NaxOy -?

1) Let m (NaxOy) = 3.1 g, then m (Na) = 2.3 g, m (O) = 0.8 g;
2) Using the periodic system of D.I.Mendeleev, determine the molar masses of Na and O:
M (Na) = Ar (Na) = 23 g / mol;
M (O) = Ar (O) = 16 g / mol;
3) Calculate the amount of substance Na and O:
n (Na) = m (Na) / M (Na) = 2.3 / 23 = 0.1 mol;
n (O) = m (O) / M (O) = 0.8 / 16 = 0.05 mol;
4) Determine the ratio of Na and O in an unknown substance:
x: y = n (Na): n (O) = 0.1: 0.05 = 2: 1;
Na2O.

Answer: Unknown substance – Na2O.