<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 
Answer:
1 electron
Explanation:
These metals have a single electron in the outer shell
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Answer:
See explanation
Explanation:
We define the formal charge on an atom in a molecule as the charge it carries assuming that electrons in all chemical bonds of the molecule were shared equally between atoms irrespective of the electronegativity of each atom.
The formula for calculating the formal charge on an atom in a molecule is;
Formal Charge = [number of valence electrons on neutral atom] – [(number of lone electron pairs) + (½ number of bonding electrons)] ·
The formal charge on the two nitrogen atoms in diazomethane is obtained as follows;
Middle nitrogen atom = 5 – 8/2 – 0 = +1
Last nitrogen atom = 5 – 4/2 – 4 = –1
The Lewis structure of the molecule is shown in the image attached.