waec model questions vol1 2021 physics
Objective • Question 10
Question 10
WAEC_MODEL_QUESTIONS_VOL1
•
2021
A 2.0‑mol sample of an ideal gas initially at 300 K and 1.00 atm occupies 24.0 L. The gas is heated at constant pressure, absorbing 1746 J of heat and doing 500 J of work on the surroundings. The molar heat capacity at constant pressure is C_p = 29.1 J mol⁻¹ K⁻¹. (a) Determine the final temperature of the gas and the change in its internal energy. (b) What is the final pressure of the gas after heating?
Answer Options
A.
T_f = 320 K; ΔU = +1.10×10³ J; final pressure ≈ 1.78 atm
Correct Answer
B.
T_f = 330 K; ΔU = +1.25×10³ J; final pressure ≈ 1.87 atm
C.
T_f = 330 K; ΔU = +1.00×10³ J; final pressure ≈ 1.87 atm
D.
T_f = 340 K; ΔU = +1.30×10³ J; final pressure ≈ 1.95 atm
Correct Answer
B
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