Question 32 from the morning exam of the Chemistry and Physics exam in 2010 – please provide the solution
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32. (Two characters are missing) The exhaust pressure of pipeline natural gas is 2000 kPa, and its calorific value at a temperature of 15°C is 700,000 kJ/m2. What is the heat content of 1 m3 of natural gas at 20°C and 101.325 kPa, in kJ? Which of the following values represents this amount? A.48000 B.34850 C.59620 D.29430 Please help me solve this, thank you! !
2000*103*1/(8.314*288.15)=834.84 101.325*103*1/(8.314*293.15)=41.57 41.57*700000/834.84=34855 Choose B
Reply to 2#: What does “Parabola Drift 103” mean? In the question, it is stated that the heat generation is 700,000 kJ/m2 at 2000 kPa and a temperature of 15 ℃, but the volume of 1 m3 is not mentioned either.
Reply to 3# daixy6539: 103 refers to 103, and the unit has been changed from KPA to Pa
Reply to 3# daixy6539: There are 3 units for the calorific value of natural gas – mole, mass, and volume. Do some research!
B. First convert it to molar heat of formation, and then proceed with the calculation.
The heat generation at a temperature of 15°C is 700,000 kJ/m2. Is there an issue with the unit? Should it be KJ/m3?
Yes, the unit is wrong; it should be to the power of 3. Did you copy the question incorrectly? That set of questions hasn’t been given yet