Advertisements
Advertisements
प्रश्न
Answer the following question.
Calculate the work done during the synthesis of NH3 in which volume changes from 8.0 dm3 to 4.0 dm3 at a constant external pressure of 43 bar. In what direction the work-energy flows?
उत्तर
Given:
Initial volume (V1) = 8.0 dm 3
Final volume (V2) = 4.0 dm 3
External pressure (Pext) = 43 bar
To find:
The work done (W) and direction of the work energy flow.
Formulae: W = - Pext Δ V = - Pext (V2 - V1)
Calculations:
From formula,
W = - Pext Δ V = - Pext (V2 - V1)
∴ W = - 43 bar × (4.0 dm3 - 8.0 dm3) = 172 dm3 bar
Now, 1 dm3 bar = 100 J
Hence, 172 dm3 × `(100 "J")/(1 "dm"^3 "bar")` = 17200 J = 17.2 kJ
Since, the work is done on the system, work-energy flows into the system from surroundings.
∴ The work done (W) = 17.2 kJ
∴ Work energy flows into the system.
APPEARS IN
संबंधित प्रश्न
Answer the following in one or two sentences.
Comment on the statement:
no work is involved in an expansion of gas in a vacuum.
Answer in brief.
Derive the expression for PV work.
Answer the following question.
One mole of an ideal gas is compressed from 500 cm3 against a constant pressure of 1.2 × 105 Pa. The work involved in the process is 36.0 J. Calculate the final volume.
The value of 1dm3 bar is ______.
Derive an expression for pressure-volume work.
Three moles of an ideal gas are expanded isothermally from 15 dm3 to 20 dm3 at a constant external pressure of 1.2 bar, calculate the amount of work in Joules.
Work done when 2 mole of an ideal gas is compressed from a volume of 5m3 to 2.5m3 at 300 K, under a pressure of 100 kpa is ______.
Which of the following is not a character of ideal drug?
Three moles of an ideal gas are expanded isothermally from a volume of 300 cm3 to 2.5 L at 300 K against a pressure of 1.9 atm. The work done in joules is ____________.
10 bar dm3 is approximately equal to ____________.
3 moles of an ideal gas is compressed from 50 dm3 to 30 dm3 against a constant external pressure of 3.039 × 105 N m−2. The work done in calories is ____________.
(1 J = 0.239 cal)
When 2 moles of an ideal gas are expanded isothermally from a volume of 12.5 L to 15.0 L against constant external pressure of 7 60 mm Hg. Calculate the amount of work done in joule?
If 200 mL of ethylene gas and 200 mL of HCl gas are allowed to react at 2 atmosphere pressure as per given reaction,
\[\ce{C2H_{4(g)} + HCl_{(g)} -> C2H5Cl_{(g)}}\]
Calculate pressure volume work in Joule.
Calculate the work done during compression of 2 mol of an ideal gas from a volume of 1m3 to 10 dm3 300K against a pressure of 100 KP a.
Two moles of an ideal gas are allowed to expand from a volume of 10 dm3 to 2 m3 at 300 K against a pressure of 101.325 KPa. Calculate the work done.
Calculate the work done during the expansion of 2 moles of an ideal gas from 10 dm3 to 20 dm3 at 298 K in a vacuum.
Write the sign convention of work done during expansion of gas.
