The answer is a. True. This is also known as the Le Chatelier's principle or The Equilibrium Law which states that if a chemical reaction is at equilibrium and then experiences changes in the condition of the reaction such as changes in concentration, pressure, or temperature of products or reactants, the system will naturally shift to achieve a new equilibrium state.
Particles in a: gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.!
The answer is Br₂ since catalysts are regenerated at the end of a reaction.
Option 2: 12.0 L of
at STP.
The standard pressure and temperature values are 1 atm and 273.15 K.
Using the ideal gas equation, number of moles of gas can be calculated which is as follows:
PV=nRT...... (1)
Here, P is pressure, V is volume, n is number of moles, R is gas constant and T is temperature.
Also, in 1 mole of any gas there are
molecules of the gas. This is known as Avogadro's number and denoted by symbol 
Thus,

Equation (1) can be rewritten as follows:

On rearranging,

Here, all the other terms are constant except volume, thus, gas with volume equal to the volume of
will have same number of molecules.
Volume of
gas and
gas is same thus,
will have same total number of molecules as
gas.