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Stoichiometry 

 

  • Stoichiometry is derived from greek words, “Stoicheion'' means element and'' metron” means measure. Stoichiometry is the study of the quantitative aspects of a chemical change. 

 

  • Stoichiometry is the calculation of the quantities of reactants and products involved in a chemical reaction. In stoichiometry we try to find the masses, volumes, number of particles, energies etc.. of reactants taking part in a chemical reaction and products formed. 

 

  • In stoichiometry we always use a balanced chemical equation because an unbalanced chemical equation violates the Law of “conservation of mass”.

 

  • Some basic relations are:  

            1 mole of a gas = GMW of a gas = 22.4 L at STP

            1 mole of a substance = GMW

 

  • For Homo atomic molecules GMW = Atomicity x GAW

 

  • For Hetero atomic molecules GMW = sum of Gram atomic weight of all constituents.It is based on the chemical equation and on the relationship between mass and moles.

 

  • The Avogadro number can be used to calculate the number of atoms or molecules in the given moles of the substances. The expression can be write as:
     

 

 

Stoichiometry Questions 

 

 Question 1: Calculate the number of atoms in 12 g of oxygen gas.  

Solution: 

Molar mass of oxygen gas = 32.0 g/mol

Number of atoms in 1 oxygen gas molecule = 2
 

 

 Question  2: Stoichiometry is derived from greek words, “Stoicheion” means element and“ metron” means _________.

(a) Compound

(b) Calculation

(c) Value

(d) Measure

Solution : Stoichiometry is derived from greek words, “Stoicheion” means element and“ metron” means measure

 Answer : (d)

 

Question 3: 1 mole of any gas   at STP occupies ___________.

(a) 32 litre

(b) 44 litre

(c) 22.4 litre

(d) All the above

Solution : 1 mole of any gas at STP occupies 22.4 litres. 

 Answer : (c)

 

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