an expanding gas absorbs 1.55 kj of heat. if its internal energy increases by 1.
ID: 931868 • Letter: A
Question
an expanding gas absorbs 1.55 kj of heat. if its internal energy increases by 1.32 kj. A) what quantity of work is involved? B) Estimate the change in H for the process.an expanding gas absorbs 1.55 kj of heat. if its internal energy increases by 1.32 kj. A) what quantity of work is involved? B) Estimate the change in H for the process.
an expanding gas absorbs 1.55 kj of heat. if its internal energy increases by 1.32 kj. A) what quantity of work is involved? B) Estimate the change in H for the process.
Explanation / Answer
Given the absorbed heat , q = +1.55 kJ ( the +ve sign indicates that heat is absorbing by the system)
The increase in internal energy , dU = 1.32 kJ
According to first law of thermodynamics , q = dU + W
Where W = work done = ?
Plug the values we get W = q - dU
= +1.55 - 1.32 kJ
= 0.23 kJ
Therefore the quantity of work involved is 0.23 kJ
The enthalpy change involved is , dH = dU+pdV
= dU + W
Therefore dH = q = +1.55 kJ
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