Answer:
They have seven electrons in their valence shell, so halogens are very reactive.
Explanation:
The halogens are the elements of the group 17 (or 7A) of the periodic table, all the elements have the valence shell , so they have 7 electrons in their valence shell.
These elements need only one electron to be stable according to the octet rule, so they are very reactive, they can react with metals, non-metals, hydrogen and with themselves.
Answer:
T₂ = 43.46 °C
Explanation:
Given that:
The heat of the formation of carbon dioxide = - 393.5 kJ/mol (Negative sign suggests heat loss)
It means that energy released when 1 mole of carbon undergoes combustion = 393.5 kJ = 393500 J
Heat gain by water = Heat lost by the reaction
Thus,
For water:
Mass of water = 5100 g
Specific heat of water = 4.18 J/g°C
T₁ = 25 °C
T₂ = ?
Q = 393500 J
So,
T₂ = 43.46 °C