Calculate the work in kilojoules done during a synthesis of ammonia in which the volume contracts from 7.4 l to 4.5 l at a constant external pressure of 44 atm . express your answer using two significant figures.
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Ответ:
Ответ:
13 kilojoules
Further explanationGiven:
A synthesis of ammonia in which the volume contracts from 7.4 l to 4.5 l at a constant external pressure of 44 atm.
Question:
Calculate the work in kilojoules done during the synthesis of ammonia. Express your answer using two significant figures.
The Process:
Let us calculate the change in volume and also convert units.
Therefore ΔV = - 2.9 L.
Since 1 L = 10⁻³ m³, then ΔV = - 2.9 x 10⁻³ m³.Since 1 atm = 1.013 x 10⁵ Pa, then external pressure is p = 44 x 1.013 x 10⁵ Pa, i.e., p = 4,457,200 Pa.Work done during expansion and contraction at constant pressure.
Let us find out the work done.
W = -12,925.88 joules
W = -13,000 joules to 2 significant figure.
Thus, the work in kilojoules done during the synthesis of ammonia is 13 kilojoules.
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Notes
If a gas increases its volume (in other words, ΔV is positive), then the gas does work (ΔW is positive). When a gas expands, it does work on the surroundings.In our case, when a gas is compressed, work is done on the gas (in other words, ΔV is negative). The surroundings do work on it. Work is done on the gas (ΔW is negative).- - - - - - - - - -
Notes:
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