<u>Answer:</u> The enthalpy of the reaction for given amount of aluminium will be 
<u>Explanation:</u>
We are given:
Moles of aluminium = 12 moles
For the given chemical reaction:
By Stoichiometry of the reaction:
If 2 moles of aluminium produces -850 kJ of energy.
Then, 12 moles of aluminium will produce = 
of energy.
Converting this into three significant figures, we get:
Thus, the enthalpy of the reaction for given amount of aluminium will be
The lack of an outlet will affect the composition of these lakes by causing an accumulation of organic and inorganic nutrients due to decomposition of living materials.
<h3>What is a lake?</h3>
Lake is a small stream of running water or a channel for water.
Lakes are usually a standing body of water or slow moving. This means that some lakes, including the Great Salt Lake and the Dead Sea, have no outlet.
The lack of an outlet will affect the composition of these lakes by causing an accumulation of organic and inorganic nutrients due to decomposition of living materials.
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Answer is valence electron, they all have total of 2 valence electron.
remember group number = valence electron
11. a. Amphoteric
12. a. NH₄⁺, H₂O
Explanation:
11. A substance that can act as either an acid or a base is said to be <u>amphoteric</u>.
Water is an amphoteric substance because it can reaction with either and acid or a base.
HCl + H₂O → Cl⁻ + H₃O⁺
NH₃ + H₂O → NH₄⁺ + OH⁻
12. What are the acids in the following equilibrium reaction?
NH₃ (aq) + H₂O (l) → NH₄⁺ (aq) +OH⁻ (aq)
H₂O water is acid 1
NH₄⁺ ammonium ion is acid 2
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amphoteric substances
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