Question

Reactant P contains 50 J of energy, and reactant Q contains 35.3 J of energy. The reactants combine to form product PQ, which contains 104 J of energy. What is the energy transformation?

Answer 1

Answer: The extra energy required is 18.7 J

Step-by-step explanation:

Law of conservation of energy states that energy can neither be created nor be destroyed but it can only be transformed from one form to another form.

We are given:

Energy of Reactant P = 50 J

Energy of Reactant Q = 35.3 J

Energy of Product PQ = 104 J

According to law of conservation of energy:

`E_P+E_Q+\Delta E=R_(PQ)\\\\50+35.3+\Delta E=104\\\\\Delta E=104-(50+35.3)=18.7J`

This extra energy is taken up by the reactants.

Hence, the extra energy required is 18.7 J

Answer 2

The chemical reaction based on the given above can be written as,
P + Q --> PQ
The energy in the left side of the equation will sum up to 85.3 J. That is the sum of the energy of P and Q. The energy in the right side of the equation is 104 J and is 18.7J more than that of the left side. This means that 18.7J of heat was absorbed during the process.