Explanation:
At room temperature, resistivity of tungsten is
and the resistivity of aluminium is
.
Temperature coefficient of aluminium (
) = 

and, 
= 
T = 
=
So, at
aluminium has resistivity which is three times the resistivity of tungsten at room temperature.
Answer:
incomplete question
Explanation:
the question is not complete
The person above above above me is very very good awnswer hope this helps
Answer:
fluorine
Explanation:
The element fluorine has 9 protons and 9 electrons.
Answer:
The standard enthalpy of formation of HgO is -90.7 kJ/mol.
Explanation:
The reaction between Hg and oxygen is as follows.

From the given,
Molar mass of HgO = 216.59 g/mol
Mass of HgO decomposed = 18.5 g
Amount of heat absorbed = 7.75 kJ
From the reaction,
The standard enthalpy of formation = 
During the decomposition of 1 mol of HgO , 90.7 kJ of energy absorbed.
For the formation of 1 mol of HgO , 90.7 kJ of energy is release
Therefore, the enthalpy of formation of mercury(II)Oxide is -90.7 kJ/mol