Question

______+HCl------>AlCl3+______ Mg+_______----->_______+H2 _______+H2CO3------>K2CO3+H2 Na+________------>NaCl+________

Answer 1

2Al +6 HCl = 2AlCl3 +3 H2

Mg +2HCl = MgCl2 + H2

K + H2CO3 = K2CO3 + H2

2Na +2 HCl =2 NaCl + H2

Answer 2

Here are the balanced chemical equations for the reactions you provided:

1. Mg + 2HCl → MgCl2 + H2 (Magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas.)

2. Al + 3HCl → AlCl3 + 3H2 (Aluminum reacts with hydrochloric acid to produce aluminum chloride and hydrogen gas.)

3. Na + H2O → NaOH + H2 (Sodium reacts with water to produce sodium hydroxide and hydrogen gas.)

4. CaCO3 + 2HCl → CaCl2 + H2O + CO2 (Calcium carbonate reacts with hydrochloric acid to produce calcium chloride, water, and carbon dioxide.)

Please note that in the second equation, aluminum (Al) is used instead of AlCl3. Aluminum reacts with hydrochloric acid to form aluminum chloride (AlCl3) along with hydrogen gas (H2).