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Asked by Rakhi Last Modified
Answer 
Hydrgen and chlorine are diatomic molecules. They are H2 and Cl2 respectively.
H2 + Cl2 ---> HCl
Reactants --
1. Hydrogen = 2 H atoms (1 H2 molecule)
2. Chlorine = 2 Cl atoms (1 Cl2 molecule)
Product--
1. HCl = 1 H atom and 1 Cl atom
No of atoms in reactants = No of atoms in product
For that, put '2' in front of HCl (product). Read it as 2HCl. Remember '2' is common for both H and Cl. So you will have 2H and 2 Cl respectively in the product side.
H2 + Cl2 ---> HCl (unbalanced/skeleton eqn)
H2 + Cl2 ---> 2HCl (balanced eqn)
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