The shape and bonding in a diatomic bromine molecule is best described as

            The shape and bonding in a diatomic bromine molecule is best described as Symmetrical and Non-Polar.

Explanation:
                   Remember polarity is induced due to Electronegativity Difference between two bonded elements. Br₂ is non polar because the electronegativity difference between two Bromine atoms is zero, i.e.

E.N of Bromine 1    =    2.96
E.N of Bromine 2    =    2.96
                                 
Difference               =    0.00
  
                      Secondly, bromine molecule is symmetrical in shape. Any object which repeats its structure when rotated at 360° is said to be symmetrical in nature. So, Br₂ when rotated repeats its face at 180°.

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Heat capacity = mcδtheat capacity = 2.676×10^3 j ..the heat capacity given is for 7.00 g of kcn,potassium cyanide which is equal to 0. mole of mole = mass  ÷ mr of kcn is 7  ÷ 65 =0.therefore: 0. of kcn liberates 2.676×10^3 j of heat1 mole   (2.676×10^3    ÷  0.107 )  × 1 =do the calculation to obtain 25009 j = 25kj