3). 150°C and 100 kPa
Gases behave ideally at high temperatures and low pressures (less intermolecular forces)
Answer: 
concentration of
= 0.50 M
concentration of
= 0.25 M
Explanation:
The dissociation equation of
is:

According to stoichiometry:
1 mole of
gives 2 moles of 
Thus 0.25 moles of
gives =
moles of 
Similarly,
1 mole of
gives = 1 mole of 
Thus 0.25 moles of
gives =
moles of 
Thus the concentration of
and
are 0.50 M and 0.25 M respectively.
Answer: The aluminium trihalide assists in the heterolytic bond fission of the bromine molecule.
Explanation:
The electrophilic aromatic bromination of acetalinide with molecular bromine requires the formation of Br+. This specie is formed when an Aluminum trihalide reacts with bromine. The Br-Br bond breaks heterolytically such that charged species are produced. This Br+ participates in the electrophilic aromatic substitution and AlX4- is formed where X4 shows a tetrahalide complex of aluminium
There are three ways nitrogen can be fixed to be useful for living things: Biologically: Nitrogen gas (N2) diffuses into the soil from the atmosphere, and species of bacteria convert this nitrogen to ammonium ions (NH4+), which can be used by plants.
Hope this helps!