Why is reaching activation energy necessary?
a)reactants require a minimum amount of energy to start to break a chemical bond. b)products require a minimum amount of energy to start to break a chemical bond. c)reactants must have the maximum amount of energy to start to break a chemical bond.
d) products must have the maximum amount of energy to start to break a chemical bond.

Answer;

A) Reactants require a minimum amount of energy to start to break a chemical bond.

Explanation;

-Activation energy is the minimum amount of energy that reactants must absorb before a chemical reaction will start. It is also referred to as free energy of activation.

-Activation energy is required to activate atoms or molecules of the reactants to a state that they can undergo chemical transformation to form products.

Heat energy (the total bond energy of reactants or products in a chemical reaction) speeds up the motion of molecules, increasing the frequency and force with which they collide. It also moves atoms and bonds within the molecule slightly, helping them reach their transition state.

The mole is simply an Avogadro's number of anything( in this case Br atoms) The Avogadro number is 6.022 x 10^23. So no of moles = No of ...