Exactly 1.5 g of a fuel burns under conditions of constant pressure and then aga

Question

Exactly 1.5 g of a fuel burns under conditions of constant pressure and then again under conditions of constant volume. In measurement A the reaction produces 25.9 kJ of heat. In measurement B the reaction produces 23.3 kJ of heat. Which measurement, A or B, corresponds to constant P and in which one is no work being done?

Select one:

a. B is done under constant pressure; A had no work being done.

b. B is done under constant pressure; B had no work being done.

c. A is done under constant pressure; A had no work being done.

d. A is done under constant pressure; B had no work being done.

Explanation / Answer

CP = Cv + R

So CP is more than CV

So, heat will be more in case of Cp

Since heat is more in measurement A,
A is at constant pressure

B is at constant volume. Constant volume also means that work done = 0

Answer:
d. A is done under constant pressure; B had no work being done.

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