Use the reaction I2(s) I2(g), H = 62.4 kJ/mol, S = 0.145 kJ/(molK) At what temperature is the reaction at equilibrium?
A.157K
B.430K
C.0.002K
D.62K

B. 430 K

Explanation:

According to Gibb's equation:

= Gibbs free energy  

= enthalpy change  = +62.4 kJ/mol

= entropy change  = +0.145 kJ/molK

T = temperature in Kelvin

 = +ve, reaction is non spontaneous

 = -ve, reaction is spontaneous

 = 0, reaction is in equilibrium

for reaction to be spontaneous

Thus the Reaction is spontaneous when temperature is 430 K.

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.