Reactions cannot occur without a certain minimum amount of energy. What is this minimum amount of energy called? A.the activatio
n energy B.the activated complex C.the kinetic energy of reactants D. the potential energy of products
2 answers:
Answer:
The correct answer is option A.
Explanation:
Activation energy is defined as amount of energy given to a chemical system with which results in chemical reaction.Or minimum amount of energy required by the reactants to undergo a chemical reaction.
Activation complex is a state in a chemical reaction which attained at very high temperature. It is an intermediate state between reactant and product.
The kinetic energy of reactants is the energy due to motion of the reactant molecules.
The potential energy of products is the chemical energy possessed in the bonds of the product.
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Answer:
Explanation:
Given parameters:
Mass of aluminium oxide = 3.87g
Mass of water = 5.67g
Unknown:
Limiting reactant = ?
Solution:
The limiting reactant is the reactant in short supply in a chemical reaction. We need to first write the chemical equation and convert the masses given to the number of moles.
Using the number of moles, we can ascertain the limiting reactants;
Al₂O₃ + 3H₂O → 2Al(OH)₃
Number of moles;
Number of moles =
molar mass of Al₂O₃ = (2x27) + 3(16) = 102g/mole
number of moles = = 0.04mole
molar mass of H₂O = 2(1) + 16 = 18g/mole
number of moles = = 0.32mole
From the reaction equation;
1 mole of Al₂O₃ reacted with 3 moles of H₂O
0.04 mole of Al₂O₃ will react with 3 x 0.04 mole = 0.12 mole of H₂O
But we were given 0.32 mole of H₂O and this is in excess of amount required.
This shows that Al₂O₃ is the limiting reactant