Q. 223.7( 3 Votes )

When Solid mercury (II)oxide is heated liquid mercury, and oxygen gas are produced. Balance the Equation.

Answer :

When solid mercury (II)oxide is heated, liquid mercury and oxygen gas are produced. The reaction is given as:

HgO(s) Hg + O2


Balancing the equation:


Step 1: Write the unbalanced equation


HgO(s) Hg + O2


Step 2: Compare the number of atoms of reactants with the number of atoms of products.



Step 3: Now, first we consider the element having unequal no. of atoms on both sides. Thus, let us consider the oxygen atom. If we multiply 2 in the reactant (in HgO), we will get the equal number of atoms as in product (in O2)



Step 4: Write the resulting equation:


2HgO(s) Hg + O2


Step 5: Now check whether the equation is balanced or not by comparing the atoms



We find that the equation is not balanced yet. As the number of


mercury atoms are unequal on the two sides. Balance the mercury atom.


Step 6: If we multiply 2 in the product (in Hg), we will get the equal number of mercury atoms both sides.



Step 7: Write the resulting equation:


2HgO(s) 2Hg + O2


Step 8: Now check whether the equation is balanced or not by comparing the atoms.



We find that the equation is balanced now.


Step 9: Write down the final balanced equation:


2HgO(s) 2Hg + O2


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