21 Chemistry -- Foundation and Fundamentals of Chemistry

State all that is implied by the chemical equation 2H2 + O2 ➡2H2O. Give its limitation and their remedies.

State all that is implied by the chemical equation 2H2 + O2 ➡2H2O. Give its limitation and their remedies.

All that is implied by the chemical equation 2H2 + O2  ➡  2H2O are

It explains that on hydrolysis of water we get hydrogenation and oxygen as a product.

# Molecular mass of H2 =2 g/mol

# Molecular mass of O2 =32 g/mol

From the balanced chemical equation, 

2 × 2=4 g of hydrogen requires 32 g of Oxygen to react completely.

# Limitations of this equation are

1. It doesn't give the conditions required to carry out chemical equation.

2. It doesn't tell whether heat is absorbed or evolved in the reaction unless the equation is modified by thermochemical equation.

3. It doesn't tell about  rate of reaction and time required.

#Remedies of this reaction are

In order to make chemical equation more informative, the following corrections can be done.

1. External conditions such as temperature, pressure and catalyst can be given above and below the arrow indicating chemical equation.

2. Exothermicity and endothermicity of reaction are mentioned by introducing notation.

3. Symbols like s, l, g and aq for solid , liquid, gas and aqueous state should be notated in reaction.

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