Question

match the numbers with the part of the energy diagram
potential energy
reactants
products
reaction pathway
energy of reactants
energy of products
△h
activation energy
75
225
150

Explanation:

Step1: Identify energy of reactants

From the graph, the potential - energy of reactants is at 75. So, Energy of Reactants = 75.

Step2: Identify energy of products

From the graph, the potential - energy of products is at 225. So, Energy of Products = 225.

Step3: Calculate $\Delta H$

$\Delta H$ is the difference between the energy of products and reactants. $\Delta H=E_{products}-E_{reactants}=225 - 75=150$.

Step4: Identify activation energy

Activation energy is the difference between the highest - point on the energy curve and the energy of reactants. The highest - point on the curve is above 225 and the energy of reactants is 75. But since we only have 75, 225 and 150 as options and based on the above calculations, we can't accurately determine activation energy from the given options. However, if we assume the highest - point is 300 (from the y - axis scale), activation energy would be $300 - 75=225$. But with the given options, we match based on the previous calculations.

Answer:

Energy of Reactants: 75
Energy of Products: 225
$\Delta H$: 150
Activation Energy: No correct option from given numbers