Answer: The for the reaction is 212 kJ
Explanation:
According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.
According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.
The net reaction is
The intermediate balanced chemical reaction will be,
(1)
(2)
(3)
Therefore, the for the reaction is 212 kJ
Answer: The limiting reactant is
Na
. The theoretical yield is 112 g
NaCl
.
Explanation:
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Answer: The reaction produces 2.93 g H₂.
M_r: 133.34 2.016
2Al + 6HCl → 2AlCl₃ + 3H₂
Moles of AlCl₃ = 129 g AlCl₃ × (1 mol AlCl₃/133.34 g AlCl₃) = 0.9675 mol AlCl₃
Moles of H₂ = 0.9675 mol AlCl₃ × (3 mol H₂/2 mol AlCl₃) = 1.451 mol H₂
Mass of H₂ = 1.451 mol H₂ × (2.016 g H₂/1 mol H₂) = 2.93 g H₂
Explanation:
Answer: Change in chemical composition of reactants is an event which must always occur for a chemical reaction to take place.
Explanation:
A chemical reaction is defined as a reaction in which there will always occur change in chemical composition of reactant species.
For example,
Here, chemical composition of both and HCl changes which leads to the formation of silver chloride and nitric acid. Hence, it is a chemical reaction.
Therefore, we can conclude that change in chemical composition of reactants is an event which must always occur for a chemical reaction to take place.