The combustion reaction of Mg +1/2 O2-->MgO produces a very bright white flame and high heat. Verify that the following reactions produce the same overall reaction:
a) MgO+2HCl-->MgCl2+H2O
b) Mg+2HCl-->MgCl2+H2
c) H2+1/2O2-->H2O ΔH°= -285.8 KJ/mol
Sorry but I don't understand the question.
To verify if the reactions mentioned produce the same overall reaction as the combustion of Mg, we need to balance and sum up the chemical equations. Let's analyze each option:
a) MgO + 2HCl --> MgCl2 + H2O
To balance this equation:
MgO + 2HCl --> MgCl2 + H2O
The equation shows that magnesium oxide (MgO) reacts with hydrochloric acid (HCl) to produce magnesium chloride (MgCl2) and water (H2O). This is not the same reaction as the combustion of magnesium. Hence, option (a) does not produce the same overall reaction.
b) Mg + 2HCl --> MgCl2 + H2
To balance this equation:
Mg + 2HCl --> MgCl2 + H2
The equation represents the reaction between magnesium (Mg) and hydrochloric acid (HCl) to produce magnesium chloride (MgCl2) and hydrogen gas (H2). Again, this is not the same reaction as the combustion of magnesium. Therefore, option (b) does not produce the same overall reaction.
c) H2 + 1/2O2 --> H2O; ΔH° = -285.8 KJ/mol
This equation represents the formation of water (H2O) from the reaction of hydrogen gas (H2) and oxygen gas (O2). Additionally, the given ΔH° value indicates the enthalpy change associated with this reaction. Although this reaction involves oxygen, it is not the combustion of magnesium and does not produce the same overall reaction.
After evaluating all the options, none of the provided reactions produce the same overall reaction as the combustion of magnesium.