The given example is a chemical reaction.
The contents (separated as reactants and products) :

The written reaction is :

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Answer:
a.
△H=−72 kcal
The energy required for production of 1.6 g of glucose is [molecular mass of glucose is 180 gm]
b.

The iron(III) ions and chloride ions remain aqueous and are spectator ions in a reaction that produces solid barium sulfate.
6 Atoms!
Mg = 1 atom.
O = 4 atoms.
A = 1 atom.
The oxidation of at least two atoms should change
Answer:
NaHCO3 = No. of atoms are 1 sodium + 1 Hydrogen + 1 carbon + 3 oxygens = 6 atoms per molecule.