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.
Na – 2.3 wt. h.
O – 0.8 wt. h.
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;
Answer: Unknown substance – Na2O.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.