Answer:
The iron is in the +3 oxidation state, which is what the III means.
Answer:Volume occupied by the gas at standard pressure is 162.5 L.
Explanation:
Pressure of the gas when it occupies volume of 190 L = 650 mmHg
Volume occupied by the gas when the gas is at standard pressure.
The value of standard pressure = 1 atm = 760 mmHg

According to Boyle's Law:
(at constant temperature)


Volume occupied by the gas at standard pressure is 162.5 L.
Na is a metal
N is a nonmetal
thus, they form an ionic bond, where electrons are transferred from the metal, to the nonmetal
It mostly because they're so reactive and if they were in their pure form and touched water they would have a very violent reaction. They also want to be more stable so they look for more electrons and quickly bond.