3. Hydrogen gas can be produced in the laboratory by thereaction of magnesium me

Question

3. Hydrogen gas can be produced in the laboratory by thereaction of magnesium metal with hydrochloric acid.          Mg(s) + 2HCI (aq) ---> MgCI2 (aq) + H2 (g) a) Identify the limiting reactant when 6.00 g HCI reacts with5.00 g Mg. b) How many grams of hydrogen can be produced when 6.00 g HCIis added to 5.00 g of Mg? 3. Hydrogen gas can be produced in the laboratory by thereaction of magnesium metal with hydrochloric acid.          Mg(s) + 2HCI (aq) ---> MgCI2 (aq) + H2 (g) a) Identify the limiting reactant when 6.00 g HCI reacts with5.00 g Mg. b) How many grams of hydrogen can be produced when 6.00 g HCIis added to 5.00 g of Mg?

Explanation / Answer

a) Mole of HCl: 6g/36.458g/mol=0.165(mol)     Mole of Mg: 5g/24.31g/mol =0.206mol Mg + 2HCl --> MgCl2 + H2 mole ratio between Mg and HCl = 1:2 Compare mole beween Mg and HCl = 0.206 : 0.165/2=0.206 :0.0825      0.0825<0.206=> HCl is limitingreactant b) Mg + 2HCl --> MgCl2 + H2 0.165                             -->0.165mol Mass of H2: m = 0.165mol*1.008g/mol =0.16632(g) mole ratio between Mg and HCl = 1:2 Compare mole beween Mg and HCl = 0.206 : 0.165/2=0.206 :0.0825      0.0825<0.206=> HCl is limitingreactant b) Mg + 2HCl --> MgCl2 + H2 0.165                             -->0.165mol Mass of H2: m = 0.165mol*1.008g/mol =0.16632(g)

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