1. Indicate the compounds from which ones can obtain oxides under heating: CaCO3, Na2CO3, KNO3, Pb(NO3)2, HNO3. 2. Complete the equations of reactions, indicate bases and give their names & structure formulas:
а) CaO + H2O =
b) SiO2 + KOH =
c) Fe(OH)3
3. Calculate the molar mass of a compound which account of substance is 0.3 mole and mass is 24.4 g.
4. Find the mass part of Oxygen in oxide Fe3O4.
5. What is the mass of 3.01·1021 atoms of Nitrogen?

saryglarSayan    2   18.01.2021 10:34    0