a. The system does work and energy will be given off. b. The system does work an

Question

a. The system does work and energy will be given off.    b. The system does work and energy will be absorbed.       c. Work is done to the system and energy will be given off. d. Work is done to the system and energy will be absorbed.

Choose the correct statement, based on this reaction energy diagram.

a. The reaction is exothermic and energy will be given off. b. The reaction is exothermic and energy will be absorbed. c. The reaction is endothermic and energy will be given off. d. The reaction is endothermic and energy will be absorbed.

Air is compressed in a piston, doing 132 J of work to the system. If the change in volume is ?V = -1.00 L, the pressure on the piston is

a. 1.00 atm b. 1.30 atm c. 1.32 atm d. 1.34 atm

Could not get diagram pulled up

Explanation / Answer

Answer – We are given the diagram of a piston and in this one there is initial piston with 1 atm external pressure and there are 5 moles and after the reaction there are 4 moles and volume get decreased with same pressure, so the when volume decrease, means isothermal reversible compression then there is work done on the system and it is positive means absorbed, so correct statement is –

d. Work is done to the system and energy will be absorbed.

There is energy get positive, since there is change in volume get negative. So this is a endothermic reaction and correct statement is - d. The reaction is endothermic and energy will be absorbed.

We are given, change in volume, V = -1.00 L , W = 132 J , P = ?

We know formula

W = -P*V

132 J = -P*(-1.00 L)

Now we need to convert the J to atm.L

We know

1 J = 0.00987 L.atm

So, 132 J = ?

= 1.303 L.atm

1.303 L.atm = -P * (-1.00 L)

So, P = 1.303 L.atm /1.00 L

           = 1.30 atm

So, answer is b. 1.30 atm

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