# Calculate the molar masses of equivalents of substances entering into reactions: a) Zn + O2 = b) S + O2 = c) FeCl3 +

Calculate the molar masses of equivalents of substances entering into reactions: a) Zn + O2 = b) S + O2 = c) FeCl3 + NaOH = d) NiSO4 + KOH = e) H2SO4 + CuCl2 = f) Al2O3 + HNO3 =

a) Zinc reacts with oxygen. Zinc oxide is formed.

2 Zn + O2 = 2 ZnO
b) Sulfur and oxygen enter into a chemical reaction of the compound and form tetravalent sulfur oxide.

S + O2 = SO2
c) The reaction takes place between substances such as ferric chloride and sodium hydroxide. As a result of a chemical reaction, ferric hydroxide and sodium chloride salt are formed.

FeCl3 + 3 NaOH = FeOH3 + 3 NaCl
d) Nickel sulfate salt reacts with potassium hydroxide and forms nickel hydroxide and potassium sulfate salt. This reaction proceeds according to the type of exchange.

NiSO4 + 2 KOH = Ni (OH) 2 + K2SO4
e) Sulfuric acid reacts with copper chloride and forms hydrochloric acid and copper sulfate salt. It also proceeds according to the type of exchange.

H2SO4 + CuCl2 = 2 HCl + CuSO4
f) Alumina and nitric acid enter into a chemical reaction. As a result of the reaction, a substance is formed: the aluminum nitrate salt is trivalent and water is released. This is a substitution reaction.

Al2O3 + 6 HNO3 = 2 Al (NO3) 3 + 3 H2O.

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