Question

2.5g Mg is burnt with 1g of O2 in a closed vessel to form MgO. Which is the excess reagent here?

Answer 1

Magnesium is the excess reagent here.

Explanation:

The equation is:

2 Mg + O2 ----> 2MgO

• According to the balanced chemical equation, magnesium is the excess reagent while oxygen is the limiting reagent.
• Durn g the chemical reaction, when a reactant is not completely used up at the end of the reaction then it is called an excess reagent.
• While the substance that is completely consumed up is known as the limiting reagent.