Answer: There are 0.499 moles present in 
molecules of Boron trichloride.
Explanation:
According to mole concept, there are 
molecules present in 1 mole of a substance.
Hence, number of moles present in molecules are as follows.
Thus, we can conclude that there are 0.499 moles present in molecules of Boron trichloride.
The <span>R group is the correct answer</span>
That friend is not correct. Physical change is characterized by a change in appearance without any change in composition. So, if the appearance did not change in the situation, then there is no change in the system. This type of change affects the form of a substance but not the composition or the structure of the molecules. Examples of this type of change are ice melting, cutting a paper into half, clay is molded to a new shape, butter melting, water evaporating. The change that involves a change in chemical composition is classified a chemical change. In this type of change, chemical reactions would take place.
Catalysts lower the activation energy of a chemical reaction. Catalyst is a substance that speeds a chemical reaction. It is not consumed as the reaction proceeds. A catalyst offers a new route for faster reaction. Catalysts are classified as homogeneous ( same state as the reactants ) or heterogeneous (different state as the reactants). Platinum would be a heterogeneous catalyst. CFCs would be a homogeneous catalyst. Magnesium would be a heterogeneous catalyst.
<span>It is the equation that helped prove that matter and energy are not separate but different forms of the same thing.</span>
