Answer:
The temperature at which rhenium becomes superconducting is -271.6 ºC.
Explanation:
We can convert the temperature given in Kelvin, which is an absolute scale, into degrees Celsius. which is a relative scale, by a simple algebraic translation, that is:
(1)
Where:
- Temperature, measured in degrees Celsius.
- Temperature, measured in Kelvins.
If we know that 
, then the temperature given in degrees Celsius is:
The temperature at which rhenium becomes superconducting is -271.6 ºC.
<h3>Answer;</h3>
= 13.629 g of ZnCl2
<h3><u>Explanation;</u></h3>
The equation for the reaction.
Zn(s)+2HCL(aq)=>ZnCl2(aq)+H2(g)
Number of moles of Zinc;
Moles = mass/RAM
= 6.5 g/65g/mol
= 0.1 moles
The mole ration of Zn : ZnCl2 is 1 : 1
Therefore, number of moles of ZnCl2 is 0.1 moles
Mass = moles × Molar mass
= 0.1 ×136.286 g/mol
<u> = 13.629 g</u>
I think the correct answer is the first option. It has nonpolar bonds and a symmetrical structure. The structure of a BF3 molecule shows a symmetrical trigonal geometry. The net dipole moment of the molecule is zero therefore it is polar.
